TITLE    : Procedure for moving a filesystem between disks that are in
           different volume groups using the cplv command.
OS LEVEL : AIX 4.x
DATE     : 25/11/99
VERSION  : 1.0

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In the following example, an RS6000 has 1 one disk with rootvg on, and has
just had a second disk installed. The second disk needs a volume group
creating on it and a data filesystem transferring to the new disk. Ensure
that you have a full system backup befor you start.


lspv

hdisk0         00009922faf79f0d    rootvg         
hdisk1         None                None           

df -k

Filesystem    1024-blocks      Free %Used    Iused %Iused Mounted on
/dev/hd4             8192      1228   86%     1647    41% /
/dev/hd2           380928     40984   90%    11014    12% /usr
/dev/hd9var         32768     20952   37%      236     3% /var
/dev/hd3            28672      1644   95%      166     3% /tmp
/dev/hd1            53248     51284    4%       95     1% /home
/dev/lv00          200704    110324   46%     1869     4% /home/john
/dev/ftplv         102400     94528    8%       32     1% /home/ftp
/dev/lv01          114688     58240   50%       59     1% /usr2

In this example the /usr2 filesystem needs to be moved to the new disk 
drive, freeing up space in the root volume group. 


1, Create a data volume group on the new disk (hdisk1), the command below
   will create a volume group called datavg on hdisk1 with a PP size of 
   32 Meg:-

   mkvg -s 32 -y datavg hdisk1

2, Create a jfslog logical volume on the new volume group :-

   mklv -y datalog -t jfslog datavg 1

3, Initialise the jfslog :-

   logform /dev/datalog

   logform: destroy /dev/datalog (y)?y

4, Umount the filesystem that is being copied :-

   umount /usr2

5, Copy the /usr2 logical volume (lv01) to a new logical volume (lv11) on 
   the new volume group :-

   cplv -y lv11 -v datavg lv01

   cplv: Logical volume lv01 successfully copied to lv11 .

6, Change the /usr2 filesystem to use the new (/dev/lv11) logical volume 
   and not the old (/dev/lv01) logical volume :-

   chfs -a dev=/dev/lv11 /usr2

7, Change the /usr2 filesystem to use the jfslog on the new volume group 
   (/dev/datalog) :- 

   chfs -a log=/dev/datalog /usr2

8, Mount the filesystem :-

   mount /usr2

   df -k

   Filesystem    1024-blocks      Free %Used    Iused %Iused Mounted on
   /dev/hd4             8192      1220   86%     1649    41% /
   /dev/hd2           380928     40984   90%    11014    12% /usr
   /dev/hd9var         32768     20952   37%      236     3% /var
   /dev/hd3            28672      1644   95%      166     3% /tmp
   /dev/hd1            53248     51284    4%       95     1% /home
   /dev/lv00          200704    110324   46%     1869     4% /home/john
   /dev/ftplv         102400     94528    8%       32     1% /home/ftp
   /dev/lv11          114688     58240   50%       59     1% /usr2

9, Once the filesystem has been checked out, the old logical volume can
   be removed :-

   rmfs /dev/lv01

   Warning, all data contained on logical volume lv01 will be destroyed.
   rmlv: Do you wish to continue? y(es) n(o)? y
   rmlv: Logical volume lv01 is removed. 


If you wish to copy further filesystems repeat parts 4 to 9.