[linux-lvm] Removing a PV from a mirror

Misc Things formisc at gmail.com
Mon Jan 11 18:26:17 UTC 2010

oh... sorry to hear.
Actually, Fredrick, you may just answered my question that i posted earlier
about moving VG to another disk(s) and changing the stiping to linear. I
think (hope) that the command i needed is : lvconvert -m 0 ....

i hope you did take a backup ?

On Mon, Jan 11, 2010 at 11:54 AM, Fredrik Tolf <fredrik at dolda2000.com>wrote:

> Hi list,
> I've got a mirror volume with two S-ATA disks, one of which started
> getting bad sectors recently, and I want to replace it. I'm having
> trouble removing it from the volume, however.
> When googling around on the subject, I've read everywhere that I
> shouldn't have to do anymore than remove it, and LVM should discover
> that and reconvert the mirror back into a linear volume. To be a bit
> more careful, though, I ran "echo 1 >/sys/block/sdh/device/delete" to
> have it removed properly in software first. Much to my surprise, shall
> we say, that just made the LV die a horrible death; it started returning
> EIO for every access to it, and I had to reboot the server to get it
> working again. Again, this is the proper procedure according to what
> I've been reading on the net; did I do it wrong, somehow, or are my
> sources completely off? (And if this doesn't work, then what would
> actually happen if the disk were to fail physically?)
> As I rebooted the server, I tried disconnecting the disk in advance, but
> that made LVM unable to bring the VG back online at all.
> How am I supposed to take this disk out of the volume? If I should use
> `lvconvert -m 0 $LV', then how do I specify which disk is to be removed?
> I'm using a stock Debian stable (Lenny) installation, meaning Linux
> 2.6.24 and LVM2 2.02.39.
> Appreciative for any answers,
> Fredrik Tolf
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
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