Installation and User's Guide

SnapshotcachesizeUse the snapshotcachesize option to specify an appropriate size to create thesnapshot.The size estimation is needed for the cache file containing the original data forblocks that change during an online image backup or open file support operationOn a volume with high file system write activity, this value can be increased toremove the condition where the snapshot cache fills up during the operation. Thesnapshot cache location is specified with the snapshotcachelocation option. Thisoption is only valid if OFS or online image backup has been configured and theLVSA has been selected as the snapshot provider.For online image backups, use the snapshotcachesize option with the backupimage command, the include.image option, or in your dsm.opt file.For open file support operations, use the snapshotcachesize option in your dsm.optfile or with the include.fs option.Supported ClientsThis option is valid for all Windows clients. The Tivoli Storage Manager client APIdoes not support this option. The server can also define this option.Options FilePlace this option in the client options file (dsm.opt). You can set this option on theImage-Snapshot tab of the Preferences editor.Syntax►► SNAPSHOTCACHESize size ►◄ParameterssizeSpecifies the maximum size of the snapshot cache file as a percentage of theused space of the volume for which the snapshot is taken The range of valuesis 1 through 100. The default is 1. Note that Tivoli Storage Manager alwaysuses a minimum of 500 MB.If the snapshot cache size exceeds the amount of free space on the volumewhere the snapshot cache file resides, the client truncates the snapshot cachefile size to 90 percent of the available free space and writes the followingmessage in dsmerror.log:Snapshot cache size adjusted to accommodate insufficient spaceExamplesOptions file:snapshotcachesize 40Command line:-snapshotcachesize=40Related informationChapter 12. Processing options 469