How to Move the Volume group.

[unixguy_1]

Dear Freinds,

I want to move the particular volume group to Some other Storage Disk.
Existing Volume Group is in One Storage.

I thing pvmove command is used to move that Vg to another storage disk.

Volume group name is Vg01 and new storage disk is C2t0d0.
pla amend the below mentioned command is correct or not?

"pvmove /dev/vg01/ /dev/dsk/c2t0d0"

Pls anyone help to me.

Regards,
Unixguy.

[Johnson Punniyalingam]

have assigned points to 4 of 36 responses to my questions. for your Dear Freinds,

and you mentioned call Closed ..?

how to advice you if you d'not have time to assing points for your dear Freinds,

Thanks,
Johnson

[Sajjad Sahir]

not pvmove
Vgexport is the command to export a volume group ok

Sajjad

[Johnson Punniyalingam]

Thanks Friends ,

The Call has been closed.

http://forums13.itrc.hp.com/service/forums/questionanswer.do?threadId=1291159

Regards,
Unixguy.

[Ganesan R]

Hi,

pvmove is one of the option. Another way is mirror the old disks with new disks and remove the old disks from the mirror. This is the safest method I would say.

Anyway the command syntax of pvmove would be

#pvmove
#pvmove /dev/dsk/c1t2d0 /dev/dsk/c2t2d0

Hope this helps.

[Robert-Jan Goossens_1]

Hi,

# pvmove /dev/dsk/cxtydz /dev/dsk/c2t0d0

Change the cxtydz device file into your old disk device file.

Regards,
Robert-Jan

[Johnson Punniyalingam]

>>I thing pvmove command is used to move that Vg to another storage disk.<<

should always do

man pvmove

(pvmove command is used move Logical Volumes, not Volume Group)

Volume group name is Vg01 and new storage disk is C2t0d0.
pla amend the below mentioned command is correct or not?

"pvmove /dev/vg01/ /dev/dsk/c2t0d0"<<<

[Ganesan R]

Hi Unixguy,

Note that pvmove should be done within the volume group. So you need to add the new physical volumes into the existing volume group before start pvmove

Steps you need to follow.

1.#pvcreate
2.#vgextend /dev/vg01
3.#pvmove

[unixguy_1]

Johnson ,i have doubt

iam not able to move entire Volume Group(Vg01)

only i can do to move the Logical Volume.

am i right?

[unixguy_1]

Hi Johnson iam waitind for your reply.....

Regards,
Unixguy.

[Johnson Punniyalingam]

pvmove allows you to move the allocated physical extents (PEs) on SourcePhysicalVolume to one or more other physical volumes (PVs). You can optionally specify a source LogicalVolume in which case only extents used by that LV will be moved to free (or specified) extents on DestinationPhysicalVolume(s). If no DestinationPhysicalVolume is specifed, the normal allocation rules for the volume group are used.
If pvmove gets interrupted for any reason (e.g. the machine crashes) then run pvmove again without any PhysicalVolume arguments to restart any moves that were in progress from the last checkpoint. Alternatively use pvmove --abort at any time to abort them at the last checkpoint.

You can run more than one pvmove at once provided they are moving data off different SourcePhysicalVolumes, but additional pvmoves will ignore any logical volumes already in the process of being changed, so some data might not get moved.

pvmove works as follows:

1. A temporary 'pvmove' logical volume is created to store details of all the data movements required.

2. Every logical volume in the volume group is searched for contiguous data that need moving according to the command line arguments. For each piece of data found, a new segment is added to the end of the pvmove LV. This segment takes the form of a temporary mirror to copy the data from the original location to a newly-allocated location. The original LV is updated to use the new temporary mirror segment in the pvmove LV instead of accessing the data directly.

3. The volume group metadata is updated on disk.

4. The first segment of the pvmove logical volume is activated and starts to mirror the first part of the data. Only one segment is mirrored at once as this is usually more efficient.

5. A daemon repeatedly checks progress at the specified time interval. When it detects that the first temporary mirror is in-sync, it breaks that mirror so that only the new location for that data gets used and writes a checkpoint into the volume group metadata on disk. Then it activates the mirror for the next segment of the pvmove LV.

6. When there are no more segments left to be mirrored, the temporary logical volume is removed and the volume group metadata is updated so that the logical volumes reflect the new data locations.

Note that this new process cannot support the original LVM1 type of on-disk metadata. Metadata can be converted using vgconvert(8).

[Ganesan R · Accepted solution]

Hi Unixguy,

you can move logical volume as well as entire disk by using "pvmove"

You can move a logical volume from one disks to another disks

You can also move entire disk data to another disk. In this case whatever the logical volumes on the old disk. will be moved to new disk.

[unixguy_1]

Thanks Friends,

I closed this thread....

Thanks a lot Johnson.....

Regards,
Unixguy.