Caching data synchronous system and method in process of accessing iSCSI (Internet Small Computer System Interface) storage device

Abstract

The invention discloses caching data synchronous system and method in a process of accessing an iSCSI (Internet Small Computer System Interface) storage device. The system and the method can judge whether caching data volume of a virtual disk is qualified or not after receiving a data access request sent by a starter to the virtual disk appointed by a target terminal and starting a caching data synchronizing process of the virtual disk; if qualified, the data access of the virtual disk is blocked and the data access of the virtual disk is opened after an appointed operation is carried out, and an access request is restarted to normally respond; and if not qualified, the access request of a starter end is responded by selecting a normal response or sending a busy response mode according to the current state of a counter or the counter. Therefore, the system and the method can complete the caching data synchronization and can keep that the data access of the started end is not stopped.

Description

technical field [0001] The present invention relates to a cache (cache) data synchronization system and method, in particular to a cache data that can not only complete the cache data synchronization but also keep the data access of the initiator from being suspended during the access process of the iSCSI storage device Synchronization systems and methods. Background technique [0002] Internet Small Computer System Interface (Internet Small Computer System Interface, hereinafter referred to as: iSCSI) is based on the TCP / IP protocol and is used to establish and manage the interconnection between IP storage devices, hosts and clients, and create storage area networks (Storage Area Networks). Area Network, referred to as SAN). SAN makes it possible to apply the SCSI (Small Computer System Interface) protocol to a high-speed data transmission network, and this transmission is performed between multiple data storage networks at the block-level. The SCSI structure is based on ...

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Problems solved by technology

[0013] But the problem of above-mentioned prior art is, because relatively new iSCSI product has all increased the support to snapshot, the data access speed of the virtual disk with snapshot is relatively low, correspondingly speaking, synchronous cache data also needs more time, which is likely to exceed the tolerance limit of the initiator's own retry mechanism

For example, when the cached data reaches 300MB, the data access speed of the virtual disk with snapshots may be lower than 1MB per second, and it takes more than 300 seconds to synchronize the cached data, which is likely to exceed the time limit of the initiator. At this time, follow the The traditional method of blocking will cause the data access of the initiator to be suspended

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