VERITAS File System 4.1 Administrator's Guide

Online Backup Using File System Snapshots
Making a Backup
Chapter 6 121
Making a Backup
Here are some typical examples of making a backup of a 300,000 block file system named
/home using a snapshot file system on /dev/vx/dsk/fsvol/vol1 with a snapshot mount
point of /backup/home:
• To back up files changed within the last week using cpio:
# mount -F vxfs -o snapof=/home,snapsize=100000 \
/dev/vx/dsk/fsvol/vol1 /backup/home
# cd /backup
# find home -ctime -7 -depth -print | cpio -oc > /dev/rmt/0m
# umount /backup/home
• To do a full backup of /home, which exists on disk /dev/vx/dsk/fsvol/vol1, and use dd
to control blocking of output onto tape device using vxdump:
# vxdump f - /dev/vx/dsk/fsvol/vol1 | dd bs=128k > /dev/rmt/0m
• To do a level 3 backup of /dev/vx/dsk/fsvol/vol1 and collect those files that have
changed in the current directory:
# vxdump 3f - /dev/vx/dsk/fsvol/vol1 | vxrestore -xf -
• To do a full backup of a snapshot file system:
# mount -F vxfs -o snapof=/home,snapsize=100000 \
/dev/vx/dsk/fsvol/vol1 /backup/home
# vxdump f - /dev/vx/dsk/fsvol/vol1 | dd bs=128k > /dev/rmt/0m
The vxdump utility ascertains whether /dev/vx/dsk/fsvol/vol1 is a snapshot mounted as
/backup/home and do the appropriate work to get the snapshot data through the mount point.