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Zmanda Recovery Manager 3.0 for MySQL on Ubuntu Server

Apr 08, 2009, 22:06 (0 Talkback[s])
(Other stories by Alolita Sharma)

"For large databases you may want to use ZRM's raw backup feature. Raw or physical backups are exact copies of your data. This shortens the time needed for backups as well as for restores. Calculating storage requirements ahead of time is easier since raw backups are just a copy of your database files. However, the major drawback of raw backups is that they can only be restored to the identical MySQL server version and machine architecture used to produce the original backup.

"ZRM takes advantage of filesystem and storage volume snapshots when performing raw backups. Snapshots capture changes to your data at a given point in time without having to copy the entire filesystem or volume. As noted in the Plugin Framework section above, ZRM supports filesystem snapshots for NetApp SnapManager, Solaris ZFS, Veritas VxFS, as well as storage volume snapshots for Linux LVM, Windows VSS, and EMC CLARiiON SnapView.

"Logical backups should be considered if you need to support multiple machine architectures and your data must be highly portable. Logical backups offer table level granularity and can be performed without taking the MySQL server offline. However, logical backups are slower because MySQL server must fetch the database structure and content and then convert the data into a logical format, usually a text file with SQL statements. Due to the conversion, storage requirements for logical backups may be larger than the size of the original data source. To offset the conversion overhead, ZRM can be configured to compress, using gzip or other compression tools, the backup images produced."

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