April 2010
Intermediate to advanced
276 pages
6h 16m
English
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How it works…
mylvmbackup works by using the following procedure:
FLUSH TABLES: ForcesMyISAMbuffers to disk as far as possible, but it does not lock the tables.FLUSH TABLES WITH READ LOCK: ForcesMyISAMbuffers to disk that have been dirtied since the lastFLUSH TABLEScommand. This time, all queries modifying the databases are locked.lvcreate -s: This creates a consistent snapshot.UNLOCK TABLES: This writes to the database resume.- Mount the snapshot to a temporary directory.
tarand compress the snapshot. If configured (not covered in this appendix),rsyncthis file to another location.- Destroy the snapshot.
Be aware that when holding an open snapshot, the "copy on write" architecture of LVM can cause significant performance degradation—one I/O ...
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