Performing File system Backup ( solaris 10 )
Strategies for Scheduled Backups
A full backup is a complete file system backup.
An incremental backup copies only files in the file system that have been added or modified since a previous lower-level backup.
Backups are often referred to as dumps.
Use dump level 0 to perform a full backup.
Use dump levels 1 through 9 to schedule incremental backups
# ufsdump 0S filesystem_name ==> to determine the size of the file system
to be backed up
or
# ufsdump 3S filesystem_name
S - size estimate
The /etc/dumpdates file records backups if the -u option is used with the ufsdump command.
# cat /etc/dumpdates
Backing Up an UNMOUNTED File System
/usr/sbin/ufsdump
The syntax for the ufsdump command is:
ufsdump option(s) argument(s) filesystem_name
Tape Back Ups
Perform the following steps to use the ufsdump command to start a tape backup:
1. Become the root user to change the system to single-user mode, and
unmount the file systems.
# /usr/sbin/shutdown -y -g300 “System is being shutdown for backup”
2. Verify that the /export/home file system was unmounted with the
shutdown command. If not, unmount it manually.
3. Check the integrity of the file system data with the fsck command.
# fsck /export/home
4. Perform a full (Level 0) backup of the /export/home file system.
# ufsdump 0uf /dev/rmt/0 /export/home
# ufsrestore tf /dev/rmt/0 ==> t - to list the table of contents of the backup media
# ufsrestore tvf /dev/rmt/0
Remote Backups to a Tape
To perform a backup on a remote tape device.
ufsdump options remotehost:tapedevice filesystem
To perform remote backups across the network, the system with the tape drive must have an entry in its /.rhosts file for every system that uses the tape drive.
The following example shows how to perform a full (Level 0) backup of the
/export/home file system on the host1 system, to the remote tape device on the host2 system.
# ufsdump 0uf host2:/dev/rmt/0 /export/home
