HP JFS 3.3 and HP OnLineJFS 3.3 VERITAS File System 3.3 System Administrator's Guide

Chapter 4 89

Online Backup

Using a Snapshot File System for Backup

point of /backup/home:

• To back up ﬁles changed within the last week using cpio:

# mount -F vxfs -o snapof=/dev/dsk/c0t0d0, \

snapsize=100000 /dev/dsk/c0t1d0 /backup/home

# cd /backup

# find home -ctime -7 -depth -print | \

cpio -oc > /dev/rmt/0m

# umount /backup/home

• To do a full backup of /dev/dsk/c0t0d0 and use dd to control

blocking of output onto tape device using vxdump:

# vxdump f - /dev/rdsk/c0t0d0 | dd bs=128k >

/dev/rmt/0m

• To do a level 3 backup of /dev/dsk/c0t0d0 and collect those ﬁles

that have changed in the current directory:

# vxdump 3f - /dev/rdsk/c0t0d0 | vxrestore -xf -

• To do a full backup of a snapshot ﬁle system:

# mount -o snapof=/dev/dsk/c0t0d0,snapsize=100000 \

/dev/dsk/c0t1d0 /backup/home

# vxdump f - /dev/rdsk/c0t1d0 | dd bs=128k >

/dev/rmt/0m

The vxdump utility will ascertain whether /dev/rdsk/c0t1d0 is a

snapshot mounted as /backup/home and do the appropriate work to get

the snapshot data through the mount point.