Originally Posted by for archival purpose

https://www-304.ibm.com/support/docv...d=isg3T1000167
https://www.ibm.com/i/c.gif Moving a JFS/JFS2 File System to a New Volume Group

https://www.ibm.com/i/c.gif Technote (FAQ) Question Moving a JFS/JFS2 File System to a New Volume Group
Answer This document describes how to move a journaled file system (JFS) or enhanced journaled file system (JFS2) from one volume group to another. Information in this document applies to AIX Versions 4 and 5.
Moving file systems from one volume group to another
Logical volumes specific to rootvg
Related documentation Moving file systems from one volume group to another

ATTENTION: Make sure a full backup exists of any data you intend to migrate before using these procedures.
In AIX, storage allocation is performed at the volume group level. Storage cannot span volume groups. If space within a volume group becomes constrained, then space that is available in other volume groups cannot be used to resolve storage issues.
The solution to this problem is to add more physical volumes to the relevant volume group. This may not be an option in all environments. If other volume groups contain the required free space, the alternative is to move the required logical volumes to the desired volume group and expand them as needed.
The source logical volume can be moved to another volume group with the cplv command. The following steps achieve this.
ATTENTION: The logical volume should be inactive during these steps to prevent incomplete or inconsistent data. If the logical volume contains a mounted file system, then that file system should be unmounted first. If this logical volume is being used as a RAW storage device, then the application using this logical volume should close the device or be shut down.
Logical volumes specific to rootvg

The following logical volumes and file systems are specific to the rootvg volume group and cannot be moved to other volume groups:
Logical Volume File System or Description
------------------------------------------------------
hd2 /usr
hd3 /tmp
hd4 /
hd5 <boot logical volume>
hd6 <primary paging space>
hd8 <primary JFS or JFS2 log>
hd9var /var
Related documentation

For more in-depth coverage of this subject, the following IBM publications are recommended:



Cross Reference information Segment Product Component Platform Version Edition Operating SystemAIXInstallation- backup- restore


Historical Number isg1pTechnote0280

http://unix.derkeiler.com/Mailing-Li...3-04/0416.html

Moving a JFS FIle to a New Volume Group

1. backup data you intend to migrate
2. unmount fs where lv resides
3. copy the source logical volume to the desired volume group with the cplv
command.
For example, where myvg is the NEW volume group and mylv is the name of
the user's
logical volume, enter:

cplv -v myvg mylv

4. All JFS require a log device. If JFS log does not already exists on the
new volume group,

mklv -t jfslog myvg 1

This will return a new jfslog such as loglv00. This will need to be
reformatted with the
logform command to function as a JFS log.

logform /dev/loglv00

5. Change the filesystem to reference a log device that exists in the new vg
and the new
logical volume with the chfs command.

For example where myfilesystem is the name of the user's filesystem,
enter:

chfs -a dev=/dev/lv00 -a log=/dev/loglv00 /myfilesystem

6. RUn fsck to ensure filesystem integrity,

fsck -p /dev/lv00

7. Mount the file system. For example, where myfilesystem is the name of the
user's
file system, enter:

mount /myfilesystem

At this point the migration is complete and any applications or users can
now access the
data in this filesystem. To change the logical volume name, proceed to
step 8. Note: If you receive errors from the preceding step do not continue, contact AIX
support center.

8. Remove the source logical volume with the rmlv command:

rmlv mylv

9. Rename and reset any needed attributes on the new logical volume with the
chlv or chmod commands.

For example, where mylv is the name of the user's logical volume, enter:

chlv -n mylv lv00
-------------------------------------------------------------

Joe Leyden

-----Original Message-----
From: Green, Simon [mailto:Simon.Green@EU.ALTRIA.COM]
Sent: Wednesday, April 30, 2003 9:36 AM
To: aix-l@Princeton.EDU
Subject: Re: move logical volume and file system to different vg

Sorry: I obviously wasn't clear. They were intended as three completely
independent alternatives, not three related steps.

Simon Green
Altria ITSC Europe s.a.r.l.

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