08-29-2012
Further to @Peasant and to stress the point.
This assumes that you do not have a modern SAN where the "discs" are resizeable.
A Volume Group is made up of a Group of Physical Discs (aka. Volumes). Any individual Physical Disc cannot be in more than one Volume Group. If you can release at least one whole disc from VG01, you can create a VG03 from the now-spare disc(s).
The only real reason to do this is if you are about to exceed the maximum number of Logical Volumes allowed in a Volume Group.
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LEARN ABOUT OSX
fs_flushmount
FS_FLUSHMOUNT(1) AFS Command Reference FS_FLUSHMOUNT(1)
NAME
fs_flushmount - Forces the Cache Manager to discard a mount point
SYNOPSIS
fs flushmount [-path <dir/file path>+] [-help]
fs flushm [-p <dir/file path>+] [-h]
DESCRIPTION
The fs flushmount command removes from the cache all information associated with each mount point named by the -path argument. The next
time an application accesses the mount point, the Cache Manager fetches the most current version of it from the File Server. Data cached
from the associated volume is not affected.
The command's intended use is to discard information about mount points that has become corrupted in the cache. (The Cache Manager
periodically refreshes cached mount points, but the only other way to discard them immediately is to reinitialize the Cache Manager by
rebooting the machine.) Symptoms of a corrupted mount point included garbled output from the fs lsmount command, and failed attempts to
change directory to or list the contents of a mount point.
To flush cached data rather than a mount point, use the fs flush or fs flushvolume command.
OPTIONS
-path <dir/file path>+
Names each mount point to flush from the cache. Partial pathnames are interpreted relative to the current working directory, which is
also the default value if this argument is omitted.
-help
Prints the online help for this command. All other valid options are ignored.
EXAMPLES
The following command flushes from the cache the mount point for user "pat"'s home directory:
% fs flushm /afs/abc.com/usr/pat
PRIVILEGE REQUIRED
The issuer must have the "l" (lookup) permission on the ACL of the root directory of the volume that houses the file or directory named by
the -path argument, and on the ACL of each directory that precedes it in the pathname.
SEE ALSO
fs_flush(1), fs_flushvolume(1), fs_lsmount(1)
COPYRIGHT
IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved.
This documentation is covered by the IBM Public License Version 1.0. It was converted from HTML to POD by software written by Chas
Williams and Russ Allbery, based on work by Alf Wachsmann and Elizabeth Cassell.
OpenAFS 2012-03-26 FS_FLUSHMOUNT(1)