Backup & Restore OS

This Tech Tip describes a backup and restore procedure for the Solaris 8 or 9 Operating System using

the ufsdump command.

Backing Up the OS

1. For this example, we are using c0t0d0s0 as a root partition. Bring the system into single-user mode

(recommended).

# init -s

2. Check the partition consistency.

# fsck -m /dev/rdsk/c0t0d0s0

3. Verify the tape device status:

# mt status

Or use this command when you want to specify the raw tape device, where x is the interface:

# mt -f /dev/rmt/x status

4. Back up the system:

a) When the tape drive is attached to your local system, use this:

# ufsdump 0uf /dev/rmt/0n /

b) When you want to back up from disk to disk, for example, if you want to back up
c0t0d0s0 to c0t1d0s0:

# mkdir /tmp/backup

# mount /dev/dsk/c0t1d0s0 /tmp/backup

# ufsdump 0f - / | (cd /tmp/backup;ufsrestore xvf -)

c) When you want to back up to a remote tape, use this. On a system that has a tape drive, add the

following line to its
/.rhosts file:

hostname root

where
hostname is the name or IP of the system that will run ufsdump to perform the backup. Then run the

following command:

# ufsdump 0uf remote_hostname:/dev/rmt/0n /

Restoring the OS

1.
For this example, your OS disk is totally corrupted and replaced with a new disk. Go to the ok prompt

and boot in single-user mode from the Solaris CD.

ok> boot cdrom -s

2. Partition your new disk in the same way as your original disk.

3. Format all slices using the
newfs command. For example:

# newfs /dev/rdsk/c0t0d0s0

4. Make a new directory in
/tmp:

# mkdir /tmp/slice0

5. Mount
c0t0d0s0 into
/tmp/slice0:

# mount /dev/dsk/c0t0d0s0 /tmp/slice0

6. Verify the status of the tape drive:

# mt status

If the tape drive is not detected, issue the following command:

# devfsadm -c tape

or

# drvconfig

# tapes

# devlinks

Verify the status of tape drive again and make sure the backup tape is in the first block or file number

is zero. Use the following command to rewind the backup tape:

# mt rewind

7. Go into the
/tmp/slice0 directory and you can start restoring the OS.

# cd /tmp/slice0

# ufsrestore rvf /dev/rmt/0n

If you want to restore from another disk (such as
c0t1d0s0), use the following command:

# mkdir /tmp/backup

# mount /dev/dsk/c0t1d0s0 /tmp/backup

# ufsdump 0f - /tmp/backup | (cd /tmp/slice0;ufsrestore xvf -)

8. After restoring all the partitions successfully, install bootblock to make the disk bootable. This

example assumes your
/usr is located inside the "/" partition:

# cd /tmp/slice0/usr/platform/'uname -m'/lib/fs/ufs

# installboot bootblk /dev/rdsk/c0t0d0s0

9. To finish restoring your OS, reboot the system.