демон блокировки LVM (LVM locking daemon)
Описание (Description)
LVM commands use lvmlockd to coordinate access to shared storage.
When LVM is used on devices shared by multiple hosts, locks will:
• coordinate reading and writing of LVM metadata
• validate caching of LVM metadata
• prevent conflicting activation of logical volumes
lvmlockd uses an external lock manager to perform basic locking.
Lock manager (lock type) options are:
• sanlock: places locks on disk within LVM storage.
• dlm: uses network communication and a cluster manager.
