How to Create an Incremental Dump of a UFS Snapshot

If you want to create a file-system snapshot incrementally, which means only the files that have been modified since the last snapshot are backed up, use the ufsdump command with the new N option. This option specifies the file-system device name to be inserted into the /etc/dumpdates file for tracking incremental dumps.

The following ufsdump command specifies an embedded fssnap command to create an incremental dump of a file system.

1. Become superuser.

2. Create an incremental dump of a file-system snapshot.

   # ufsdump 1ufN /dev/rmt/0 /dev/rdsk/c0t1d0s0 `fssnap -F ufs -o raw,bs= /export/scratch,unlink /dev/rdsk/c0t1d0s0`

   The -o raw option is used in the example to display the name of the raw device instead of the block device. By using this option, you make it easier to embed the fssnap command in commands that require the raw device instead, such as the ufsdump command.

3. Verify the snapshot is backed up.

   # ufsrestore ta /dev/rmt/0