[linux-lvm] moving logical volumes to another system *remotely* - how?
linux-lvm at linbit.com
Fri Feb 23 17:32:20 UTC 2007
/ 2007-02-23 16:59:23 +0100
\ Tomasz Chmielewski:
> paddy at panici.net schrieb:
> >On Fri, Feb 23, 2007 at 12:48:07PM +0100, Tomasz Chmielewski wrote:
> >>I have a server which stores several LVM-2 logical volumes.
> >>As this system is pretty loaded, I'd like to move some of the logical
> >>volumes to another machine. It has to be done remotely, so I can't do it
> >>as described in the LVM HOWTO (where one basically adds/replaces disks in one machine).
> >>My common sense tells me that I should:
> >>1. Unmount/not use the logical volumes on the source server
> >>2. Make volumes of the same size on the target server
> >>3. Copy it somehow over network
> >>I'm not sure of 2 (make volumes of exactly the same size)
> >check your PE size, otherwise does what it says on the tin.
> Hmm, how? I just want to move some (not all) logical volumes.
> I guess fdisk is a good idea?
> # fdisk -l /dev/LVM2/ocsi1
> Disk /dev/LVM2/ocsi1: 3221 MB, 3221225472 bytes
> 3221225472 / 1024 = 3145728
> lvcreate -L3145728k -n ocsi1 LVM2
> Hmm, hopefully, it's the right size?
lvs --units k
> >>and 3 (how to copy it all over network, if possible, using SSH only).
> >netcat and dd over forwarded port
> Thanks for the idea.
dd if=/dev/$vg/$lv bs=32M |
buffer -S 10m -s 512k |
gzip -1 |
ssh -T $target -- \
buffer -s 512k |
dd bs=32M of=/dev/$t_vg/$t_lv"
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