Troubleshooting Backup Problems
This section describes some basic troubleshooting techniques to use when backing up and
The root (/) File System Fills Up After You Back Up a File System
You back up a file system, and the root (/) file system fills
up. Nothing is written to the media, and the ufsdump command prompts you
to insert the second volume of media.
Reason Error Occurred
How to Fix the
If you used an invalid destination device name with the -f option, the
ufsdump command wrote to a file in the /dev directory of the root
(/) file system, filling it up. For example, if you typed /dev/rmt/st0 instead
of /dev/rmt/0, the backup file /dev/rmt/st0 was created on the disk rather than being
sent to the tape drive.
Use the ls -tl command in the /dev directory to
identify which file is newly created and abnormally large, and remove it.
Make Sure the Backup and Restore Commands Match
You can only use the ufsrestore command to restore files backed up with
the ufsdump command. If you back up with the tar command, restore with
the tar command. If you use the ufsrestore command to restore a tape
that was written with another command, an error message tells you that the
tape is not in ufsdump format.
Check to Make Sure You Have the Right Current Directory
It is easy to restore files to the wrong location. Because the
ufsdump command always copies files with full path names relative to the root
of the file system, you should usually change to the root directory
of the file system before running the ufsrestore command. If you change to a
lower-level directory, after you restore the files you will see a complete file
tree created under that directory.
When you use the interactive command, a ufsrestore> prompt is displayed, as shown
in this example:
# ufsrestore ivf /dev/rmt/0
Verify volume and initialize maps
Media block size is 126
Dump date: Fri Jan 30 10:13:46 2004
Dumped from: the epoch
Level 0 dump of /export/home on starbug:/dev/dsk/c0t0d0s7
Extract directories from tape
Initialize symbol table.
At the ufsrestore> prompt, you can use the commands listed on Chapter 28, UFS Backup and Restore Commands (Reference), in System Administration Guide: Devices and File Systems to find
files, create a list of files to be restored, and restore them.