What Is Dlm Lock Model?

1.	What Is Dlm Lock Model?
Answer» DLM is a short abbreviation for Distributed Lock MANAGER. A lock manager is a traffic cop who controls access to resources in the cluster, such as access to a GFS file system. GFS2 uses locks from the lock manager to synchronize access to file system metadata (on shared STORAGE) CLVM uses locks from the lock manager to synchronize updates to LVM volumes and volume groups (also on shared storage) In addition, rgmanager uses DLM to synchronize SERVICE states. without a lock manager, there would be no control over access to your shared storage, and the nodes in the cluster would corrupt each other's data.

Answer»

DLM is a short abbreviation for Distributed Lock MANAGER.
A lock manager is a traffic cop who controls access to resources in the cluster, such as access to a GFS file system.
GFS2 uses locks from the lock manager to synchronize access to file system metadata (on shared STORAGE)
CLVM uses locks from the lock manager to synchronize updates to LVM volumes and volume groups (also on shared storage)
In addition, rgmanager uses DLM to synchronize SERVICE states.
without a lock manager, there would be no control over access to your shared storage, and the nodes in the cluster would corrupt each other's data.

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