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Template:ZRM LVM snapshot requirements >

Template:ZRM LVM snapshot requirements

MySQL Configuration

  • Both the ZRM server and MySQL server require the configuration of sudo privileges (see the next section). On Solaris platforms, this means the SMCsudo package must be installed.
  • If you are backing up a remote MySQL server, the destination directory specified on the Backup Where page must exist on the MySQL server as well as the ZRM server. The MySQL backup user (OS-level) must have read/write permission to access this directory.

The mysql data must reside on logical volumes. The following are some of the possible configurations

  • All MySQL data is on a single logical volume
  • Specific database directories are on different logical volumes
  • For databases containing InnoDB based tables, the lvm snapshot can only be used if the database directory, the InnoDB data files, and the InnoDB logs are on logical volumes. The InnoDB shared data files can be on separate logical volumes. The InnoDB logs can be on separate logical volume

Pre-conditions for Using LVM Snapshots

The MySQL backup user must be granted sudo privileges to execute lvm commands on the MySQL server. Add a line similar to the following example to /etc/sudoers on the MySQL server:

mysql ZRMserver.mycompany.com Server>=NOPASSWD:/bin/mount,NOPASSWD:/bin/umount,NOPASSWD:/bin/df, \
      NOPASSWD:/sbin/lvdisplay,NOPASSWD:/sbin/lvcreate,NOPASSWD:/sbin/lvremove

Where ZRMserver.mycompany.com is the fully-qualified domain name for the ZRM server. Note that if lvm commands are installed in non-standard locations, the above example would not work without editing it to reflect the different paths.

Additional free extents in the logical volume are needed for creating snapshots. You can check extents using the vgdisplay command.

The free extents required are specified in mysql-zrm.conf.

LVM stores the snapshot blocks corresponding to the blocks that are modified in the original logical volume in the snapshot volume. If the database is highly active during the backup, many blocks will be modified and the snapshot volume may run out of space.

Specifying a sufficient amount of space for creating the snapshot is critical; if the snapshot volume runs out of space, the backup will not be consistent.

All MySQL database files (data, log, indexes) must be stored in LVM logical volumes to ensure consistency. If any of the files are not on LVM, the snapshot is skipped, and either a raw backup via mysqlhotcopy or a logical backup using mysqldump will be taken based on the storage engines of the tables in each of the databases.

MySQL Configuration

  • Both the ZRM server and MySQL server require the configuration of sudo privileges (see the next section). On Solaris platforms, this means the SMCsudo package must be installed.
  • If you are backing up a remote MySQL server, the destination directory specified on the Backup Where page must exist on the MySQL server as well as the ZRM server. The MySQL backup user (OS-level) must have read/write permission to access this directory.

The mysql data must reside on logical volumes. The following are some of the possible configurations

  • All MySQL data is on a single logical volume
  • Specific database directories are on different logical volumes
  • For databases containing InnoDB based tables, the lvm snapshot can only be used if the database directory, the InnoDB data files, and the InnoDB logs are on logical volumes. The InnoDB shared data files can be on separate logical volumes. The InnoDB logs can be on separate logical volume

Pre-conditions for Using LVM Snapshots

The MySQL backup user must be granted sudo privileges to execute lvm commands on the MySQL server. Add a line similar to the following example to /etc/sudoers on the MySQL server:

mysql ZRMserver.mycompany.com Server>=NOPASSWD:/bin/mount,NOPASSWD:/bin/umount,NOPASSWD:/bin/df, \
      NOPASSWD:/sbin/lvdisplay,NOPASSWD:/sbin/lvcreate,NOPASSWD:/sbin/lvremove

Where ZRMserver.mycompany.com is the fully-qualified domain name for the ZRM server. Note that if lvm commands are installed in non-standard locations, the above example would not work without editing it to reflect the different paths.

Additional free extents in the logical volume are needed for creating snapshots. You can check extents using the vgdisplay command.

The free extents required are specified in mysql-zrm.conf.

LVM stores the snapshot blocks corresponding to the blocks that are modified in the original logical volume in the snapshot volume. If the database is highly active during the backup, many blocks will be modified and the snapshot volume may run out of space.

Specifying a sufficient amount of space for creating the snapshot is critical; if the snapshot volume runs out of space, the backup will not be consistent.

All MySQL database files (data, log, indexes) must be stored in LVM logical volumes to ensure consistency. If any of the files are not on LVM, the snapshot is skipped, and either a raw backup via mysqlhotcopy or a logical backup using mysqldump will be taken based on the storage engines of the tables in each of the databases.

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