Red Hat CLUSTER SUITE - CONFIGURING AND MANAGING A CLUSTER 2006 Uživatelský manuál stáhnout pdf (Strana 16)

Distributed Lock Manager

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Red Hat Cluster Suite v.4 includes a Distributed Lock Manager (DLM)

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Primarily used by Red Hat Global File System

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Available for general purpose use by any application

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Closely mirrors the original Digital VMS DLM

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A DLM is a highly functional, distributed (cluster-wide), application

synchronization subsystem

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Processes use the DLM to synchronize access to a shared resource (e.g. a

file, program, or device) by establishing locks on named resources

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Permits the creation of distributed applications

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e.g Oracle RAC (which uses a private DLM)

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Provides a collection of services

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Multiple lock spaces and concurrency (lock) modes

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Lock hierarchies/domains (resources & subresources)

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Range locking

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Lock conversions & value blocks

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Blocking notifications

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Asynchronous completions

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Red Hat CLUSTER SUITE - CONFIGURING AND MANAGING A CLUSTER 2006 Uživatelský manuál Strana 16