[linux-lvm] Best way to image devices in an LVM environment
Andy Smith
andy at strugglers.net
Mon Aug 28 19:48:43 UTC 2006
On Sun, Aug 27, 2006 at 07:51:09AM -0400, Matthew Gillen wrote:
> Andy Smith wrote:
> > On Sun, Aug 27, 2006 at 01:20:26PM +0800, Jim Morgan wrote:
> >> Basically you have to force one disk to fail using the raid
> >> administration software. You then remove the disk, replace it with
> >> the bigger disk, and rebuild it from the first one. The partition
> >> sizes may need adjusting. Then you force the other disk to fail, and
> >> replace it with the larger one, and then rebuild it from the other large
> >> disk.
> >
> > Well I would then be left with two large disks where sd[ab]5 (and
> > the sd[ab]4 primary partition that sd[ab]5 is the only logical
> > partition within) does not extend all the way to the end of the
> > disk. I wasn't aware that you could resize RAID-1 md arrays though,
> > I thought it was restricted to RAID-5. Is this not the case?
>
> To add another "I'm not an expert" opinion:
> Supposing you can get all 4 disks in the server at the same time,
I can't; it's a rackmount server with only two disk bays and two
SATA ports on the motherboard. I could have it open with another
2-port SATA controller on a PCI card, but this seems to be going a
bit far.
Since I only want to give the extra space to the single volume group
then it seems I should be able to follow this method:
http://www.debian-administration.org/articles/424
(basically involves doing what Jim said: failing out one disk,
replacing it with a bigger one, failing the other, replacing it,
then expanding partitions and filesystems.)
Seems that "mdadm --grow" works even with a RAID-1 which I wasn't
aware of.
The only problem then remaining would be how would I grow the single
pv/vg out to the full extent of the new larger block device it would
be on. There doesn't seem to be a pvresize in Debain Sarge's lvm2
package..
LVM version: 2.01.04 (2005-02-09)
Library version: 1.01.00-ioctl (2005-01-17)
Driver version: 4.5.0
I see from:
http://www.robot101.net/2005/05/20/resizing-lvm2-physical-volumes/
that lvm2 has had pvresize since 2.02.00 so if I upgrade userland
tools (my kernel is 2.6.16.19) then would I just need to do a
pvresize after expanding the block device that my single pv/vg is
on?
Cheers,
Andy
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