IBM Tivoli Storage Manager for UNIX and Linux Backup-Archive ...

For Linux clients only: By default, Tivoli Storage Manager performs a snapshotimage backup of file systems residing on a logical volume created by the LinuxLogical Volume Manager, during which the volume is available to other systemapplications.Attention: File systems managed by Tivoli Storage Manager for spacemanagement are not enabled for image backup.Related tasks“Performing snapshot-based file backup and archive and snapshot-based imagebackup” on page 145For Tivoli Storage Manager clients running on AIX 5.3 or later JFS2 file systems asroot user, snapshot-based image backup will be created using snapshots by default.Optionally, you can enable snapshot-based file level backup and archive operationsby specifying the snapshotproviderfs option. If for some reason a snapshot cannotbe taken, Tivoli Storage Manager will attempt to perform a static image backup orregular file backup.Before you perform an image backupBefore you perform an image backup, there are some items that you need toconsider.The following items are the image backup considerations.v Ensure that no other application is using the volume when you run a staticimage backup. To ensure a consistent image during backup processing, if a filespace is detected on the volume the client will unmount and remount thevolume as read only, so that no other applications can write to it. If the volumeis in use when the client attempts to unmount, the backup will fail. If the clientcannot unmount and remount the volume as read only because it is in use, andsnapshot image backup is not available, you can use the dynamicimage option toforce the client to perform an image backup without unmounting andremounting the volume in read-only mode. Set the dynamicimage option in aninclude.image statement or from the command line. The backup can becorrupted if applications write to the volume while the backup is in progress.This can be corrected by running fsck after a restore to fix any corrupted blocks.If no file system is detected on the volume being backed up, ensure that allapplications writing to the volumes are quiesced. The backup-archive client usesthe file system table and mount table to detect the supported file systems.Do not include system files in an image backup because file systems beingactively used cannot be unmounted.For AIX and Linux only: If you perform an image backup of a mounted filesystem which is mounted to another mount point and specified in the filesystem table, then after completing the image backup, all mount options for thisfile system, except read or write state, will be lost.Important: If a mounted file system has nested mount points, unmount thembefore attempting a backup. Otherwise, Tivoli Storage Manager will be unable tounmount the volume. The file system is rendered busy if it contains any mounts.v Use the include.image option to assign a management class to the volume image.If you do not assign a management class, the default management class is usedfor the image.v You can exclude a volume from image backup using the exclude.image option.v You must use the mount point for the file system volume on which you want toperform an image backup. Tivoli Storage Manager will not back up a file systemvolume without the use of a mount point. Back up file systems using theChapter 4. Backing up your data 139