Snapshotcachesize

The size estimation is needed for storing the original data blocks for modified and deleted data for the point in time when the snapshot was taken.

For snapshot-based file backup or archive, use the snapshotcachesize option with the include.fs option, or in the server stanza in the dsm.sys file.

For snapshot-based image backups, use the snapshotcachesize option with the backup image command, the include.image option, or in your dsm.sys file.

Supported Clients

This option is valid for AIX® and Linux clients only. The Tivoli® Storage Manager client API does not support this option. The server can also define this option.

Options File

Place this option in the server stanza in the dsm.sys file. You can set this option on the Image-Snapshot tab of the Preferences editor.

Parameters

size

Specifies an appropriate size to create the snapshot for storing the original data blocks for modified and deleted data for the point in time when the snapshot was taken. The value is the percent of the file system size that is changed due to file system activity. The range of values is 1 to 100 percent. For AIX JFS2 and Linux the default value is 100 percent of the file system size. If a sufficient amount of free space is not available to create the snapshot, the command fails with an error message. You can then either increase the size of the volume group or retry the operation. If based on your experience with your AIX JFS2 file system activity, you find that a snapshot size of 100 percent is not necessary, you can fine-tune the value.