VERITAS File System 4.1 Administrator's Guide

Storage Checkpoints
Storage Checkpoint Administration
Chapter 5 99
ctime= Thu 3 Mar 2005 7:00:17 PM PST
mtime= Thu 3 Mar 2005 7:00:17 PM PST
flags= nodata, largefiles
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.