VERITAS File System 4.1 Administrator's Guide

Storage Checkpoints
Storage Checkpoint Administration
Chapter 5100
• If a Storage Checkpoint is originally mounted as a read-only Storage Checkpoint, you can
remount it as a writable Storage Checkpoint using the -o remount option.
• To mount a Storage Checkpoint of a file system, first mount the file system itself.
• To unmount a file system, first unmount all of its Storage Checkpoints.
WARNING If you create a Storage Checkpoint for backup purposes, do not mount
it as a writable Storage Checkpoint. You will lose the point-in-time
image if you accidently write to the Storage Checkpoint.
A Storage Checkpoint is mounted on a special pseudo device. This pseudo device does not
exist in the system name space; the device is internally created by the system and used while
the Storage Checkpoint is mounted. The pseudo device is removed after you unmount the
Storage Checkpoint. A pseudo device name is formed by appending the Storage Checkpoint
name to the file system device name using the colon character (:) as the separator.
For example, if a Storage Checkpoint named may_23 belongs to the file system residing on the
special device /dev/vx/dsk/fsvol/vol1, the Storage Checkpoint pseudo device name is:
/dev/vx/dsk/fsvol/vol1:may_23
To mount the Storage Checkpoint named may_23 as a read-only (default) Storage Checkpoint
on directory /fsvol_may_23, type:
# mount -F vxfs -o ckpt=may_23 /dev/vx/dsk/fsvol/vol1:may_23 \
/fsvol_may_23
The /fsvol file system must already be mounted before the Storage Checkpoint can be
mounted. To remount the Storage Checkpoint named may_23 as a writable Storage
Checkpoint, type:
# mount -F vxfs -o ckpt=may_23,remount,rw \
/dev/vx/dsk/fsvol/vol1:may_23 /fsvol_may_23
To mount this Storage Checkpoint automatically when the system starts up, put the following
entries in the /etc/fstab file:
Device Special
File
device
to fsck
mount
point
FS
type
fsck
pass
mount
at boot
mount
options
/dev/vx/dsk/fsol/
vol1
/dev/vx/rdsk/
fsvol/vol1
/fsvol vxfs 1 yes -