[linux-lvm] moving logical volumes to another system *remotely* - how?

[Lars Ellenberg]

/ 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?


how about:
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 $target -- \
	"gunzip |
	buffer -s 512k |
	dd bs=32M of=/dev/$t_vg/$t_lv"

-- 
: Lars Ellenberg                            Tel +43-1-8178292-55 :
: LINBIT Information Technologies GmbH      Fax +43-1-8178292-82 :
: Vivenotgasse 48, A-1120 Vienna/Europe    http://www.linbit.com :