Distributed lock manager: Difference between revisions

Revision as of 22:37, 3 September 2007

Revision as of 18:28, 7 September 2007

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A '''distributed lock manager''' (DLM) provides distributed applications with a means to synchronize their accesses to shared resources.

DLMs have been used as the foundation for several successful clustered file systems, in which the machines in a [[computer cluster|cluster]] can use each other's hard disks and other drivesstorage via a unified [[file system]], with significant advantages for performance and [[high-availability|availability]]. The main performance benefit comes from solving the problem of [[cache coherency|disk cache coherency]] between participating computers. The DLM is used not only for [[file locking]] but also for coordination of all disk access. This allows implementation of an efficient local [[cache]]. [[VMScluster]], the first clustering system to come into widespread use, relied on the [[OpenVMS]] DLM in just this way.

==VMS Implementation==