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Line 1: {{more citations needed\|date=October 2010}} ~~[[Operating system]]s use lock managers to organise and serialise the access to resources.~~ A '''distributed lock manager''' ('''DLM''') runs in every machine in a cluster, with an identical copy of a cluster-wide lock database. [[Operating system]]s use lock managers to organise and serialise the access to resources. In this way a DLM provides [[software application]]s which are [[distributed programming\|distributed]] across a cluster on multiple machines with a means to synchronize their accesses to [[shared resource]]s. DLMs have been used as the foundation for several successful [[clustered file system]]s, 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 (storage device)\|disk]] access. [[VMScluster]], the first clustering system to come into widespread use, relied on the [[OpenVMS]] DLM in just this way.

Distributed lock manager: Difference between revisions