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Operating systems 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. In this way a DLM provides software applications which are distributed across a cluster on multiple machines 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 cluster can use each other's storage via a unified file system, with significant advantages for performance and availability. The main performance benefit comes from solving the problem of 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, relied on the OpenVMS DLM in just this way.
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into ocfs2, such as access control lists and quotas. OCFS2 used a distributedlockmanager which resembles the OpenVMS DLM but is much simpler. Oracle announced...
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File locking is a mechanism that restricts access to a computer file, or to a region of a file, by allowing only one user or process to modify or delete...
way to achieve distributed serializability in a (distributed) system is by a distributedlockmanager (DLM). DLMs, which communicate lock (non-materialized...
folder) at the same time. metaSAN is not a file system but is a distributedlockmanager for existing NTFS or HFS+ file systems. It was hardware agnostic...
is designed. The difference between a distributed file system and a distributed data store is that a distributed file system allows files to be accessed...