Distributed lock manager: Difference between revisions

Revision as of 21:59, 13 December 2008

Revision as of 20:28, 11 February 2009

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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 storage 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. [[VMScluster]], the first clustering system to come into widespread use, reliedrelies on the [[OpenVMS]] DLM in just this way.

==VMS Implementation==