Moving a filesystem to a new PV

[Nappy_1]

I have a large file system with a large number of files.
i want to move this file system to a new array without many hours of downtime.

i'm thinking to use the following:
1/ Add the new PV to the existing VG (vgextend)
2/ Mirror the LV (lvextend -m 1 /dev/vg/lv newPV)
3/ Waiting for the mirror to complete
4/ Shutdown the application
5/ Reduce the LV (lvreduce -m 0 /dev/vg/lv)
6/ Reduce the VG
7/ import the new PV in a new VG

is that possible? can you help with the commands for step 7
is there a better solution to do that?

[Suraj K Sankari · Accepted solution]

Hi,

This looks ok but you can move PE into other disk also
#pvmove /dev/dsk/c0t5d0 /dev/dsk/c0t2d0

For more informaton see the attached file.

Suraj

[Rainer von Bongartz]

Hope you have MirrorDisk installed.
Procedure than is easy and online

1) pvcreate /dev/rdsk/

2) vgextend /dev/vgtest /dev/dsk/

3) lvextend -m 1 /dev/vgtest/lvol/dev/dsk/

4) lvreduce -m 0 /dev/vgtest/lvol1 /dev/dsk/

5) vgreduce /dev/vgtest dev/dsk/

[medali.benchaabane]

Hi Suraj,
can the pvmove done without a shutdown?

[Nido]

Yes, pvmove can be done ONLINE.
Check the details in the man page.

Note: Use nohup with pvmove to avoid any problems if terminal timout/disconnect.

Cheers!!

[sujit kumar singh]

Hi

Answer to ques number 7.

#mkdir /dev/
#mknod /dev/>new_VG>/group c 63 0xXY0000

make sure that the minor number for the group file that you give is unique on the system.

#vgimport -v /dev/
#vgchange -a y
#vgcfgbackup /dev/

regards
sujit

[Nappy_1]

Hi Sujit,
i guess that vgchgid is required before vgimport. what do you think?

[Suraj K Sankari]

Hi,

>>can the pvmove done without a shutdown?
Yes you can perfrom online
For more information see the man page of pvmove

Suraj

[sujit kumar singh]

hi

as you do a vgreduce for that new_PV the VG information from that gets removed, so is the VGiD , that is then it belongs to no VG.
so vgchgid is not required if you wish after vgreduce to add this PV to another VG on the same Machine.

regards
sujit

[Sharma Sanjeev]

Hi Nappy,

I think once you do lvreduce with old disk u also need to remove old pv key also

lvdisplay -k lvol
than
lvreduce -m 0 k lvol and key

And PVMOVE yes you can done online not down time is required, as NIDU says use nohup.

Regards
Sanjeev

[Steven E. Protter]

Shalom,

One of the first questions I ever asked HP support a long time ago was how to do this.

The answer was to back up the data with fbackup, create a new logical volume and file system and restore it.

Now this thread shows there are other answers.

But before I go dinking around with these hot methods, I take the backup first.

I've a few times used a plan similar to yours knowing a backup is in my pocket.

SEP