![]() The above described mechanisms only resolve the issues with LVM's access to the storage. lvmlockd As of 2017, a stable LVM component that is designed to replace clvmd by making the locking of LVM objects transparent to the rest of LVM, without relying on a distributed lock manager. Since this simpler solution avoids contention rather than mitigating it, no concurrent accesses are allowed, so HA-LVM is considered useful only in active-passive configurations. ![]() For the LVM's part, HA-LVM can use CLVM as a locking mechanism, or can continue to use the default file locking and reduce "collisions" by restricting access to only those LVM objects that have appropriate tags. HA-LVM Cluster-awareness is left to the application providing the high availability function. Whenever a cluster node needs to modify the LVM metadata, it must secure permission from its local clvmd, which is in constant contact with other clvmd daemons in the cluster and can communicate a desire to get a lock on a particular set of objects. The LVM also works in a shared-storage cluster in which disks holding the PVs are shared between multiple host computers, but can require an additional daemon to mediate metadata access via a form of locking.ĬLVM A distributed lock manager is used to broker concurrent LVM metadata accesses.
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