The following procedure describes how to increase the performance of the ufsdump command when you use it to backup a mounted filesystem located on a RAID-1 volume.
How to Perform a Backup of a Mounted Filesystem Located on a RAID-1 Volume
You can use the ufsdump command to backup the files of a mounted filesystem residing on a RAID-1 volume. Set the read policy on the volume to "first" when the backup utility is ufsdump. This improves the rate at which the backup is performed.
Become superuser.
Run the metastat command to make sure the mirror is in the “Okay” state.
# metastat d40
d40: Mirror
Submirror 0: d41
State: Okay
Submirror 1: d42
State: Okay
Pass: 1
Read option: roundrobin (default)
Write option: parallel (default)
Size: 20484288 blocks (9.8 GB)
A mirror that is in the “Maintenance” state should be repaired first.
Set the read policy on the mirror to “first.”
#metaparam -r first d40#metastat d40d40: Mirror Submirror 0: d41 State: Okay Submirror 1: d42 State: Okay Pass: 1 Read option: first Write option: parallel (default) Size: 20484288 blocks (9.8 GB)
Perform a backup the filesystem.
# ufsdump 0f /dev/backup /opt/test
After the ufsdump command is done, set the read policy on the mirror to “roundrobin.”
#metaparam -r roundrobin d40#metastat d40d40: Mirror Submirror 0: d41 State: Okay Submirror 1: d42 State: Okay Pass: 1 Read option: roundrobin Write option: parallel (default) Size: 20484288 blocks (9.8 GB)