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Accessing a Storage Checkpoint

You can mount Storage Checkpoints using the mount command with the mount option -o ckpt=ckpt_name.

See the mount_vxfs(1M) manual page.

Observe the following rules when mounting Storage Checkpoints:

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

# mount -V vxfs -o ckpt=may_23 /dev/vx/dsk/fsvol/vol1:may_23 \
/fsvol_may_23


  Note   The vol1 file system must already be mounted before the Storage Checkpoint can be mounted.


# mount -V vxfs -o ckpt=may_23,remount,rw \
/dev/vx/dsk/fsvol/vol1:may_23 /fsvol_may_23

Device-Special-File 

Mount-point 

fstype 

options 

backup-
frequency 

pass-number 

/dev/vx/dsk/fsvol/vol1 

/fsvol 

vxfs 

defaults 

/dev/vx/dsk/fsvol/vol1:may_23 

/fsvol_may_23 

vxfs 

ckpt=may23 

To mount this Storage Checkpoint automatically when the system starts up, put the following entries in the /etc/filesystems file:

/fsvol 

 

 

 

dev 

= /dev/vx/dsk/fsvol/vol1 

 

vfs  

= vxfs 

 

mount 

= automatic 

 

check 

= 1 (or true) 

/fsvol/vol1:may_23 

 

 

 

dev 

= /dev/vx/dsk/fsvol/vol1:may_23 

 

vfs  

= vxfs 

 

mount 

= automatic 

 

options 

= ckpt=may_23 

To mount a Storage Checkpoint of a cluster file system, you must also use the -o cluster option:

# mount -V vxfs -o cluster,ckpt=may_23 \
/dev/vx/dsk/fsvol/vol1:may_23 /fsvol_may_23

You can only mount a Storage Checkpoint cluster-wide if the file system that the Storage Checkpoint belongs to is also mounted cluster-wide. Similarly, you can only mount a Storage Checkpoint locally if the file system that the Storage Checkpoint belongs to is mounted locally.

You can unmount Storage Checkpoints using the umount command. Storage Checkpoints can be unmounted by the mount point or pseudo device name:

See the umount_vxfs(1M) manual page.

# umount /fsvol_may_23

# umount /dev/vx/dsk/fsvol/vol1:may_23


  Note   You do not need to run the fsck utility on Storage Checkpoint pseudo devices because pseudo devices are part of the actual file system.