Veritas File System 4.1 Administrator's Guide (HP-UX 11i v3, February 2007)

Storage Checkpoints

Storage Checkpoint Administration

Chapter 5 83

Removing a Storage Checkpoint

You can delete a Storage Checkpoint by specifying the remove keyword of the fsckptadm command.

Specifically, you can use either the synchronous or asynchronous method of removing a Storage

Checkpoint; the asynchronous method is the default method. The synchronous method entirely removes the

Storage Checkpoint and returns all of the blocks to the file system before completing the fsckptadm

operation.The asynchronous method simply marks the Storage Checkpoint for removal and causes

fsckptadm to return immediately. At a later time, an independent kernel thread completes the removal

operation and releases the space used by the Storage Checkpoint.

In this example, /mnt0 is a mounted VxFS file system with a Version 4 disk layout. This example shows

the asynchronous removal of the Storage Checkpoint named thu_8pm and synchronous removal of the

Storage Checkpoint named thu_7pm. This example also lists all the Storage Checkpoints remaining on the

/mnt0 file system after the specified Storage Checkpoint is removed:

# fsckptadm remove thu_8pm /mnt0

# fsckptadm list /mnt0

/mnt0

thu_7pm:

ctime= Thu 3 Mar 2005 7:00:17 PM PST

mtime= Thu 3 Mar 2005 7:00:17 PM PST

flags= nodata, largefiles

# fsckptadm -s remove thu_7pm /mnt0

# fsckptadm list /mnt0

/mnt0

Accessing a Storage Checkpoint

You can mount Storage Checkpoints using the mount command (see the mount_vxfs(1M) manual page)

with the mount option -o ckpt=ckpt_name. Observe the following rules when mounting Storage

Checkpoints:

• Storage Checkpoints are mounted as read-only Storage Checkpoints by default. If you need to write to a

Storage Checkpoint, mount it using the -o rw option.

• 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.