WO2017032147A1

WO2017032147A1 - Method and apparatus for switching internet small computer system interface session link

Info

Publication number: WO2017032147A1
Application number: PCT/CN2016/086026
Authority: WO
Inventors: 陈开业; 余斌; 张明志
Original assignee: 中兴通讯股份有限公司
Priority date: 2015-08-25
Filing date: 2016-06-16
Publication date: 2017-03-02
Also published as: CN106487826A

Abstract

Disclosed are a method and an apparatus for switching an internet small computer system interface session link. The method comprises: establishing internet small computer system interface (iSCSI) session links between an initiator and a target, and then detecting data transmission quality of a current iSCSI session link established between the initiator and the target; determining whether the data transmission quality of the current iSCSI session link satisfies a pre-set switching condition; and if the data transmission quality of the current iSCSI session link satisfies the pre-set switching condition, switching the iSCSI session links between the initiator and the target.

Description

Method and device for switching network interface computer system interface session link

Technical field

The present application relates to, but is not limited to, the field of communications technologies, and in particular, to a method and an apparatus for switching a network small computer system interface session link.

Background technique

Internet Internet Small Computer System Interface (iSCSI) is a protocol based on Transmission Control Protocol/Internet Protocol TCP/IP network. It is used to establish and manage IP storage devices, hosts and clients. Connect to each other and create a storage area network (SAN, Storage Area Network). The storage area network SAN makes it possible to apply the SCSI (Small Computer System Interface) protocol to a high-speed data transmission network, which is performed at a block-level between multiple data storage networks.

The main function of iSCSI is to encapsulate and reliably transfer large amounts of data between a client (ie, initiator) and a storage device (ie, target) on a TCP/IP network. Currently, in order to reduce the risk of service interruption due to disconnection of the iSCSI connection caused by network failure, redundant links are usually added to the iSCSI connection to improve service reliability.

That is, in the related art, there are usually multiple redundant links between the initiator and the target, and one of the redundant links is selected between the initiator and the target to exchange the iSCSI protocol data. As long as the current link between the initiator and the target can exchange iSCSI protocol data, the initiator and the target rely on the current link to perform iSCSI traffic. In this way, when the current link between the initiator and the target is repeatedly unstable, the basic interaction of the iSCSI protocol data can still be performed because the current link is not interrupted. Therefore, the initiator and the target still exist. The current link is used to perform the iSCSI service. However, the iSCSI service traffic is unstable and affects the performance of the iSCSI service. In severe cases, the system is paralyzed and the stability and reliability of the iSCSI service cannot be guaranteed.

Summary of the invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

The main purpose of the embodiments of the present invention is to provide a method and a device for switching an interface session link of a network small computer system, which aims to improve the stability and reliability of iSCSI service execution between the initiator and the target.

A method for switching a network small computer system interface session link, the method comprising:

After the network small computer system interface iSCSI session link is established between the initiator and the target, the data transmission quality of the current iSCSI session link established between the initiator and the target is detected.

Determining whether the data transmission quality of the current iSCSI session link meets a preset switching condition.

And if the data transmission quality of the current iSCSI session link meets a preset switching condition, switching an iSCSI session link between the initiator and the target.

Optionally, after the network small computer system interface iSCSI session link is established between the initiator and the target, detecting data transmission quality of the current iSCSI session link established between the initiator and the target device includes:

Sending a plurality of preset test packets on all the iSCSI session links between the initiator and the target at a preset interval, and calculating a preset test packet on each iSCSI session link within a preset time period. The number of timeout packets and/or the average duration of response packets.

Optionally, if the data transmission quality of the current iSCSI session link meets a preset switching condition, switching the iSCSI session link between the initiator and the target device includes:

If the number of timeout packets on the current iSCSI session link exceeds a preset number or the average duration of the response message exceeds a preset time, freezing the current iSCSI session link between the initiator and the target device The current iSCSI session link switches to the default iSCSI session link.

Optionally, if the data transmission quality of the current iSCSI session link meets a preset switching condition, switching the iSCSI session link between the initiator and the target device further includes:

If the difference between the number of timeout packets between the current iSCSI session link and the candidate iSCSI session link with the smallest number of timeout packets in all iSCSI session links is greater than a preset number difference, or the current iSCSI session link is The average time difference of the response packets between the candidate iSCSI session links with the shortest average response time of all the iSCSI session links is greater than the preset time difference, and the current iSCSI session link is frozen, and the initiator and the target are The current iSCSI session link between the switches is switched to the alternate iSCSI session link.

Optionally, the preset test packet is a Nopout packet defined in the iSCSI protocol; and the response packet is a Nopin packet defined in the iSCSI protocol.

A switching device for a network small computer system interface session link, the switching device of the network small computer system interface session link comprises: a detecting module, a determining module and a switching module.

The detecting module is configured to detect a data transmission quality of the current iSCSI session link established between the initiator and the target after establishing a network small computer system interface iSCSI session link between the initiator and the target.

The determining module is configured to determine whether the data transmission quality of the current iSCSI session link meets a preset switching condition.

And a switching module, configured to switch an iSCSI session link between the initiator and the target if the data transmission quality of the current iSCSI session link meets a preset switching condition.

Optionally, after the detecting module establishes a network small computer system interface iSCSI session link between the initiator and the target, detecting data transmission quality of the current iSCSI session link established between the initiator and the target includes: :

Optionally, if the data transmission quality of the current iSCSI session link meets a preset switching condition, the switching module switches the iSCSI session link between the initiator and the target device, including:

Optionally, if the data transmission quality of the current iSCSI session link meets a preset switching condition, the switching module switching the iSCSI session link between the initiator and the target device further includes:

If the difference between the number of timeout packets between the current iSCSI session link and the candidate iSCSI session link with the smallest number of timeout packets in all iSCSI session links is greater than a preset number difference, or The current iSCSI session link is frozen when the average time difference between the response packets of the pre-iSCSI session link and the candidate iSCSI session link with the shortest average response time of all iSCSI session links is greater than a preset time difference. The current iSCSI session link between the initiator and the target is switched to the alternate iSCSI session link.

A computer readable storage medium storing computer executable instructions that, when executed by a processor, implement a method of switching a network small computer system interface session link.

The method and device for switching a network small computer system interface session link according to an embodiment of the present invention, detecting the current iSCSI session chain when performing iSCSI services between the initiator and the target using the established current iSCSI session link The data transmission quality of the path; and when the data transmission quality of the current iSCSI session link is determined to meet the preset switching condition, the iSCSI session link between the initiator and the target is switched. The data transmission quality of the current iSCSI session link between the initiator and the target device can be detected when performing the iSCSI service, and when the data transmission quality of the current iSCSI session link is determined to be poor, the The iSCSI service between the initiator and the target is switched from the current iSCSI session link to other links to avoid using the current iSCSI session link when the current iSCSI session link has repeated flapping instability. The iSCSI service is implemented to effectively improve the stability and reliability of iSCSI service execution between the initiator and the target.

BRIEF abstract

1 is a schematic flowchart of an embodiment of a method for switching an interface session link of a network small computer system according to an embodiment of the present invention;

2 is a schematic diagram of an interaction process between a Nopout packet and a Nopin packet in an embodiment of a method for switching an interface of a network small computer system according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of functional modules of an embodiment of a device for switching an interface session link of a network small computer system according to an embodiment of the present invention.

Embodiments of the invention

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments in the present application may be arbitrarily combined with each other.

Embodiments of the present invention provide a method for switching an interface session link of a network small computer system.

1 is a schematic flowchart of an embodiment of a method for switching an interface session link of a network small computer system according to an embodiment of the present invention.

In an embodiment, the method for switching the network small computer system interface session link includes steps S10-S302:

Step S10: After establishing a network small computer system interface iSCSI session link between the initiator and the target, detecting data transmission quality of the current iSCSI session link established between the initiator and the target.

In the actual application, the iSCSI service may be faulty, the network cable is disconnected, the network port is faulty, and the NIC chip is suddenly faulty. The network link may be faulty due to network instability and special application scenarios. The phenomenon of business interruption. Therefore, in order to reduce the risk of service interruption caused by the disconnection of the iSCSI connection caused by the network failure, redundant links are usually added to the iSCSI connection to improve service reliability. That is, there are usually multiple redundant links between the initiator and the target. When an iSCSI session link is established between the initiator and the target to perform iSCSI services, the current iSCSI session chain established between the initiator and the target is established. The path is one of multiple redundant links, and the remaining links serve as alternate links for the current iSCSI session link due to a failure.

In this embodiment, when an iSCSI session link is established between the initiator and the target to perform the iSCSI service, the current iSCSI session link data is detected even if the current iSCSI session link is not disconnected and the iSCSI service can be normally executed. Transmission quality. The data transmission quality of the current iSCSI session link may be detected by the execution status of the current iSCSI service, the time difference of the interaction before and after the message on the current iSCSI session link, and the like. The packet that is set to be detected may be a packet defined in the iSCSI protocol, or may be a user-defined test packet, which is not limited herein.

Step S20: Determine whether the data transmission quality of the current iSCSI session link meets a preset switching condition.

Determining the current iSCSI session link by using the detected execution status of the current iSCSI service, such as the execution speed, the process, or the like, or the time difference between the time before and after the message on the current iSCSI session link. Data transmission quality, and determine whether the data transmission quality of the current iSCSI session link meets a preset switching condition.

Step S30: If the data transmission quality of the current iSCSI session link meets a preset switching condition, switch the iSCSI session link between the initiator and the target.

When the current iSCSI service is detected to be slow and the time difference between the packets on the current iSCSI session link is too long, the data transmission quality of the current iSCSI session link is poor. The current iSCSI session link may be repeated. In the case of unstable oscillation, there is no guarantee that the current iSCSI session link can stably perform the current iSCSI service. Then, it is determined that the data transmission quality of the current iSCSI session link meets the preset switching condition, and the current iSCSI session link needs to be switched. The iSCSI service between the initiator and the target is switched from the current iSCSI session link to other links in the multiple redundant links between the initiator and the target, until the data transmission quality is switched to ensure stable execution. Complete the link of the iSCSI service.

In this embodiment, not only when the current iSCSI session link is disconnected due to a fault, but also when switching to the other link among the multiple redundant links between the initiator and the target, the current iSCSI session chain can also be performed. When the path is not disconnected but the data transmission quality is poor, and the link is unstable, the iSCSI service is automatically switched from the current iSCSI session link to other links in the multiple redundant links between the initiator and the target. , effectively ensure the stability and reliability of iSCSI service execution.

In this embodiment, when the iSCSI service is performed by using the established current iSCSI session link between the initiator and the target, the data transmission quality of the current iSCSI session link is detected; and the data transmission quality of the current iSCSI session link is determined to be consistent. When the switching condition is preset, the iSCSI session link between the initiator and the target is switched. Since the data transmission quality of the current iSCSI session link between the initiator and the target can be detected when performing the iSCSI service, the initiator and the target can be timely in determining the current data transmission quality of the iSCSI session link. The iSCSI service between the devices is switched from the current iSCSI session link to other links to avoid using the current iSCSI session link to perform iSCSI services when the current iSCSI session link is repeatedly unstable. Improves the stability and reliability of iSCSI service execution between the initiator and the target.

Optionally, in other embodiments, step S10, that is, after establishing a network small computer system interface iSCSI session link between the initiator and the target, detecting a current established between the initiator and the target The data transmission quality of the iSCSI session link can include:

In this embodiment, when detecting the data transmission quality of the current iSCSI session link established between the initiator and the target device, the detection and reception of the preset test packet may be used for detection. Specifically, if the preset test packet is sent on all the iSCSI session links between the initiator and the target at a preset interval, the preset test on each iSCSI session link in the preset time period is calculated. The number of timeout packets of the packet and/or the average duration of the response packet. When the preset test packet is sent and received, the initiator can be used as the transmitting end, and the target is used as the receiving end. The target is used as the transmitting end and the initiator is used as the receiving end, which is not limited herein. The preset test packet may be a packet defined in the iSCSI protocol, or may be a user-defined test packet, which is not limited herein.

In this embodiment, the preset test packet is a Nopout packet defined in the iSCSI protocol; the corresponding response packet is a Nopin packet defined in the iSCSI protocol, as shown in FIG. 2, and FIG. 2 is The method for the interaction between the Nopout packet and the Nopin packet in the embodiment of the method for switching the interface of the network small computer system interface. If the iSCSI initiator sends an iSCSI session request to the target iSCSI target on the initiator iSCSI initiator, the iSCSI target and the iSCSI target establish an iSCSI session on the current iSCSI session. . When detecting the data transmission quality of the current iSCSI session link, the iSCSI target sends a Noopout packet, which is the default test packet with the current timestamp, to the iSCSI initiator, and sends 10 Nopout messages every 10 seconds. The packet is counted, and the number of timeout packets of the Nopout packet in the 3 minutes and the duration of the Nopin packet sent by the iSCSI initiator are optionally calculated. Alternatively, the iSCSI initiator feedback can be calculated. The average length of the Nopin message. It should be noted that the same data transmission quality detection operation can be performed on each of a plurality of redundant links between the initiator and the target, that is, on each of all iSCSI session links, to learn the initiator and the target. Data transmission quality of each link between the devices; data transmission quality detection operation is performed on the current iSCSI session link established between the initiator and the target device, which is not limited herein.

Optionally, in other embodiments, the foregoing step S30 is to switch between the initiator and the target device if the data transmission quality of the current iSCSI session link meets a preset switching condition. The iSCSI session link includes:

In this embodiment, the preset test packet is used to detect that the number of timeout packets on the current iSCSI session link exceeds the preset number or the average duration of the response packet exceeds the preset time. The data transmission quality of the current iSCSI session link is poor. The current iSCSI session link may be unstable and unstable. The current iSCSI session link cannot perform the current iSCSI service stably. The current iSCSI session link is frozen, and the current iSCSI session link between the initiator and the target is switched to the default iSCSI session link. The preset iSCSI session link may be a fixed iSCSI session link among multiple redundant links between the preset initiator and the target, or may be a chain adjacent to the current iSCSI session link. Road, here is not limited. The frozen current iSCSI session link can only receive data, and the data is sent out by the switched default iSCSI session link.

Optionally, in other embodiments, the foregoing step S30 may further include:

In this embodiment, after calculating the number of timeout packets of the preset test packet and/or the average duration of the response packet on each iSCSI session link in the preset time, the relationship between the initiator and the target is obtained. The quality of data transmission per link. If the difference between the number of timeout packets between the current iSCSI session link and the candidate iSCSI session link with the lowest number of timeout packets on all iSCSI session links is greater than the preset number difference, or the current iSCSI session link and all iSCSI session chains The average time difference between the response packets of the alternate iSCSI session link with the shortest average response time in the path is greater than the preset time difference, indicating multiple redundant links between the current iSCSI session link and the initiator and the target. If the link quality between the alternate iSCSI session links with the best data transmission quality is different, the current iSCSI session is frozen. The link switches the current iSCSI session link between the initiator and the target to an alternate iSCSI session link with the best data transmission quality among the multiple redundant links. The iSCSI service is performed by using an alternative iSCSI session link with the best data transmission quality to ensure stable and efficient execution of iSCSI services.

The embodiment of the invention further provides a device for switching the interface session link of the network small computer system.

Referring to FIG. 3, FIG. 3 is a schematic diagram of functional modules of an apparatus for switching an interface session link of a network small computer system according to an embodiment of the present invention.

In an embodiment, the switching device of the network small computer system interface session link comprises: a detecting module, a determining module and a switching module.

The detecting module 01 is configured to detect a data transmission quality of a current iSCSI session link established between the initiator and the target after establishing a network small computer system interface iSCSI session link between the initiator and the target.

In the actual application, the iSCSI service may be faulty, the network cable is disconnected, the network port is faulty, and the NIC chip is suddenly faulty. The network link may be faulty due to network instability and special application scenarios. The phenomenon of business interruption. Therefore, in order to reduce the risk of service interruption caused by the disconnection of the iSCSI connection caused by the network failure, redundant links are usually added to the iSCSI connection to improve service reliability. That is, there are usually multiple redundant links between the initiator and the target. When an iSCSI session link is established between the initiator and the target to perform iSCSI services, the current iSCSI session link established between the initiator and the target is One of multiple redundant links, the remaining links acting as backup links for the current iSCSI session link due to a failure.

The determining module 02 is configured to determine whether the data transmission quality of the current iSCSI session link meets a preset switching condition.

Determining the data transmission quality of the current iSCSI session link by using the detected execution status of the current iSCSI service, such as the execution speed, the process, or the time difference between the current and the iSCSI session link, and determining the current iSCSI session chain. Whether the data transmission quality of the road meets the preset switching conditions.

The switching module 03 is configured to switch the iSCSI session link between the initiator and the target if the data transmission quality of the current iSCSI session link meets the preset switching condition.

When the current iSCSI service is detected to be slow, and the time difference between the packets before and after the current iSCSI session is too long, the data transmission quality of the current iSCSI session link is poor. The current iSCSI session link may be In the case of repeated oscillating instability, there is no guarantee that the current iSCSI session link can stably perform the current iSCSI service. Then, it is determined that the data transmission quality of the current iSCSI session link meets the preset switching condition, and the current iSCSI session link needs to be switched. Performing iSCSI traffic between the initiator and the target from the current iSCSI session link to other links in the multiple redundant links between the initiator and the target, until the quality of the data transmission is guaranteed Stable on the link that performs the iSCSI service.

In this embodiment, when the iSCSI service is performed between the initiator and the target by using the established current iSCSI session link, the data transmission quality of the current iSCSI session link is detected; and the data transmission quality of the current iSCSI session link is determined to be in accordance with the preset. When switching conditions, switch the iSCSI session link between the initiator and the target. Since the data transmission quality of the current iSCSI session link between the initiator and the target can be detected when performing the iSCSI service, the initiator and the target can be timely in determining the current data transmission quality of the iSCSI session link. The iSCSI service between the devices is switched from the current iSCSI session link to other links to avoid using the current iSCSI session link to perform iSCSI services when the current iSCSI session link is repeatedly oscillated. Improves the stability and reliability of iSCSI service execution between the initiator and the target.

Optionally, in other embodiments, the detecting module 01 is established between the initiator and the target. After the network small computer system interfaces the iSCSI session link, detecting the data transmission quality of the current iSCSI session link established between the initiator and the target includes:

In this embodiment, when detecting the data transmission quality of the current iSCSI session link established between the initiator and the target device, the detection and reception of the preset test packet may be used for detection. The preset test packet may be sent on all the iSCSI session links between the initiator and the target at a preset interval, and the preset test message on each iSCSI session link in the preset time period is calculated. The number of timeout packets and/or the average duration of response packets. When the preset test packet is sent and received, the initiator can be used as the transmitting end, and the target is used as the receiving end. The target is used as the transmitting end and the initiator is used as the receiving end, which is not limited herein. The preset test packet may be a packet defined in the iSCSI protocol, or may be a user-defined test packet, which is not limited herein.

In this embodiment, the preset test packet is a Nopout packet defined in the iSCSI protocol, and the corresponding response packet is a Nopin packet defined in the iSCSI protocol. If the iSCSI initiator sends an iSCSI session request to the target iSCSI target on the initiator iSCSI initiator, the iSCSI target and the iSCSI target establish an iSCSI session on the current iSCSI session. . When detecting the data transmission quality of the current iSCSI session link, the iSCSI target sends a Noopout packet, which is the default test packet with the current timestamp, to the iSCSI initiator, and sends 10 Nopout messages every 10 seconds. The packet is counted, and the number of timeout packets of the Nopout packet in the 3 minutes and the duration of the Nopin packet sent by the iSCSI initiator are optionally calculated. Alternatively, the iSCSI initiator feedback can be calculated. The average length of the Nopin message. It should be noted that the same data transmission quality detection operation can be performed on each of a plurality of redundant links between the initiator and the target, that is, on each of all iSCSI session links, to learn the initiator and the target. Data transmission quality of each link between the devices; data transmission quality detection operation is performed on the current iSCSI session link established between the initiator and the target device, which is not limited herein.

Optionally, in other embodiments, if the data transmission quality of the current iSCSI session link meets a preset switching condition, the switching module 03 switches between the initiator and the target device. The iSCSI session link includes:

In this embodiment, the preset test packet is used to detect that the number of timeout packets on the current iSCSI session link exceeds the preset number or the average duration of the response packet exceeds the preset time. The data transmission quality of the current iSCSI session link is poor. The current iSCSI session link may be unstable and unstable. The current iSCSI session link cannot be stably executed. The current iSCSI session link is then frozen, and the current iSCSI session link between the initiator and the target is switched to a preset iSCSI session link. The preset iSCSI session link may be a fixed iSCSI session link among a plurality of redundant links between the preset initiator and the target, or may be a chain adjacent to the current iSCSI session link. Road, here is not limited. The frozen current iSCSI session link can only receive data, and the data is sent out by the switched default iSCSI session link.

Optionally, in other embodiments, if the data transmission quality of the current iSCSI session link meets a preset switching condition, the switching module 03 switches the iSCSI session link between the initiator and the target. include:

In this embodiment, after calculating the number of timeout packets of the preset test packet and/or the average duration of the response packet on each iSCSI session link in the preset time, the relationship between the initiator and the target is obtained. The quality of data transmission per link. If the difference between the number of timeout packets between the current iSCSI session link and the candidate iSCSI session link with the lowest number of timeout packets on all iSCSI session links is greater than the preset number difference, or the current iSCSI session link and all iSCSI session chains The average time difference between response packets of the alternate iSCSI session link with the shortest average response time in the path is greater than the preset time difference. The current iSCSI session link is frozen when the link quality between the current iSCSI session link and the alternate iSCSI session link with the best data transmission quality among the multiple redundant links between the initiator and the target is different. Switching the current iSCSI session link between the initiator and the target to an alternate iSCSI session link with the best data transmission quality among the multiple redundant links. The iSCSI service is performed by using an alternative iSCSI session link with the best data transmission quality to ensure stable and efficient execution of iSCSI services.

One of ordinary skill in the art will appreciate that all or a portion of the steps of the above-described embodiments can be implemented using a computer program flow, which can be stored in a computer readable storage medium, such as on a corresponding hardware platform (eg, The system, device, device, device, etc. are executed, and when executed, include one or a combination of the steps of the method embodiments.

Alternatively, all or part of the steps of the above embodiments may also be implemented by using an integrated circuit. These steps may be separately fabricated into individual integrated circuit modules, or multiple modules or steps may be fabricated into a single integrated circuit module. achieve.

The devices/function modules/functional units in the above embodiments may be implemented by a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices.

When the device/function module/functional unit in the above embodiment is implemented in the form of a software function module and sold or used as a stand-alone product, it can be stored in a computer readable storage medium. The above mentioned computer readable storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

Industrial applicability

The method and device for switching a network small computer system interface session link according to an embodiment of the present invention, detecting the current iSCSI session chain when performing iSCSI services between the initiator and the target using the established current iSCSI session link The data transmission quality of the path; and when the data transmission quality of the current iSCSI session link is determined to meet the preset switching condition, the iSCSI session link between the initiator and the target is switched. Since the data transmission quality of the current iSCSI session link between the initiator and the target can be detected when performing the iSCSI service, the current iSCSI session is judged When the data transmission quality of the link is poor, the iSCSI service between the initiator and the target can be switched from the current iSCSI session link to other links in time to avoid repeated attacks on the current iSCSI session link. In the case of unstable oscillations, the current iSCSI session link is still used to perform iSCSI services, which effectively improves the stability and reliability of iSCSI service execution between the initiator and the target.

Claims

A method for switching a network small computer system interface session link, the method comprising:

After establishing a network small computer system interface iSCSI session link between the initiator and the target, detecting data transmission quality of the current iSCSI session link established between the initiator and the target;

Determining whether the data transmission quality of the current iSCSI session link meets a preset switching condition;

And if the data transmission quality of the current iSCSI session link meets a preset switching condition, switching an iSCSI session link between the initiator and the target.
The method for switching a network small computer system interface session link according to claim 1, wherein said initiator and target are detected after said network small computer system interface iSCSI session link is established between the initiator and the target The data transmission quality of the current iSCSI session link established between the devices includes:

Sending a plurality of preset test packets on all the iSCSI session links between the initiator and the target at a preset interval, and calculating a preset test packet on each iSCSI session link within a preset time period. The number of timeout packets and/or the average duration of response packets.
The method for switching a network small computer system interface session link according to claim 2, wherein said switcher and said target are switched if said data transmission quality of said current iSCSI session link meets a preset switching condition The iSCSI session link between:

If the number of the timeout packets on the current iSCSI session link exceeds a preset number or the average duration of the response message exceeds a preset time, the current iSCSI session link is frozen, and the initiator and the initiator are The current iSCSI session link between the targets switches to the default iSCSI session link.
The method for switching a network small computer system interface session link according to claim 3, wherein said switcher and said target are switched if said data transmission quality of said current iSCSI session link meets a preset switching condition The iSCSI session link between the two also includes:

If the difference between the number of timeout packets between the current iSCSI session link and the candidate iSCSI session link with the smallest number of timeout packets in all iSCSI session links is greater than a preset number difference, or the current iSCSI session link is The average time difference of the response packets between the candidate iSCSI session links with the shortest average response time of all the iSCSI session links is greater than the preset time difference, and the current iSCSI session link is frozen, and the initiator and the target are Switch between the current iSCSI session link An alternative iSCSI session link.
The method for switching a network small computer system interface session link according to any one of claims 2 to 4, wherein the preset test message is a Nopout message defined in the iSCSI protocol; the response message is Nopin packet defined in the iSCSI protocol.
A switching device for a network small computer system interface session link, the switching device of the network small computer system interface session link comprises: a detecting module, a judging module and a switching module;

The detecting module is configured to detect a data transmission quality of a current iSCSI session link established between the initiator and the target after establishing a network small computer system interface iSCSI session link between the initiator and the target device;

The determining module is configured to determine whether the data transmission quality of the current iSCSI session link meets a preset switching condition;

The switching module is configured to switch an iSCSI session link between the initiator and the target if the data transmission quality of the current iSCSI session link meets a preset switching condition.
The apparatus for switching a network small computer system interface session link according to claim 6, wherein said detecting module detects said initiator after establishing a network small computer system interface iSCSI session link between the initiator and the target The data transmission quality of the current iSCSI session link established with the target includes:

Sending a plurality of preset test packets on all the iSCSI session links between the initiator and the target at a preset interval, and calculating a preset test packet on each iSCSI session link within a preset time period. The number of timeout packets and/or the average duration of response packets.
The apparatus for switching a network small computer system interface session link according to claim 7, wherein said switching module switches said startup if said data transmission quality of said current iSCSI session link meets a preset switching condition The iSCSI session link between the device and the target includes:

If the number of the timeout packets on the current iSCSI session link exceeds a preset number or the average duration of the response message exceeds a preset time, the current iSCSI session link is frozen, and the initiator and the initiator are The current iSCSI session link between the targets switches to the default iSCSI session link.
The apparatus for switching a network small computer system interface session link according to claim 8, wherein if the data transmission quality of the current iSCSI session link meets a preset switching condition, Then, the switching module switches the iSCSI session link between the initiator and the target device, and further includes:

If the difference between the number of timeout packets between the current iSCSI session link and the candidate iSCSI session link with the smallest number of timeout packets in all iSCSI session links is greater than a preset number difference, or the current iSCSI session link is The average time difference of the response packets between the candidate iSCSI session links with the shortest average response time of all the iSCSI session links is greater than the preset time difference, and the current iSCSI session link is frozen, and the initiator and the target are The current iSCSI session link between the switches is switched to the alternate iSCSI session link.
The apparatus for switching a network small computer system interface session link according to any one of claims 7 to 9, wherein the preset test message is a Nopout message defined in the iSCSI protocol; the response message is Nopin packet defined in the iSCSI protocol.
A computer readable storage medium storing computer executable instructions for performing a method of switching a network small computer system interface session link according to any one of claims 1 to 5 when executed by a processor.