[How To] Backup Solaris with ufsdump

As a good old saying says – An Apple a Day keeps the Doctor away – is also applicable on having good OS backup that will always keep headaches lesser when the hard times come. Now comes ufsdump, a usefull command to help us backup our Solaris Operating System.

Based on the man pages of ufsdump(1M):

ufsdump backs up all files specified by files_to_dump  (usually either a whole 
file system or files within a file sytem changed after a certain date) to 
magnetic tape, diskette, or disk file.

The ufsdump command can only be used on unmounted file  systems,  or  those  
mounted  read-only.  Attempting  to dump a mounted, read-write file system might  
result  in  a  system disruption  or the inability to restore files from the 
dump. Consider using the fssnap(1M) command to create a file  system  snapshot  
if  you  need a point-in-time image of a file system that is mounted.

If a filesystem was mounted with the logging option,  it  is strongly  
recommended that you run ufsdump as the root user. Running the command as  a 
non-root user might result in  the creation of an inconsistent dump.

Here are the steps for us to utilize this command given that our root (/) partition resides under c0t0d0s0:

It is recommennded to put our system on Single User Mode:

[email protected]# init -s
or
[email protected]# reboot -- -s

Check the partition for any inconsistencies:

[email protected]# fsck /dev/rdsk/c0t0d0s0

Insert the tape into the drive and verify:

[email protected]# mt -f /dev/rmt/X stat    (where X is the drive number)

Back up the system:

[email protected]# ufsdump 0uf /dev/rmt/0n /

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