[TriLUG] LVM2 recovery options . . .

[John Brier]

> Date: Tue, 08 Sep 2009 16:59:28 -0400
> From: Justin Parker <xjparkerx at gmail.com>
> Subject: [TriLUG] LVM2 recovery options . . .
> To: Triangle Linux Users Group General Discussion <trilug at trilug.org>
> Message-ID: <4AA6C5B0.2030601 at gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Does anyone have any particular lvm2 recovery procedures they would
> recommend?
>
> Thanks,
> Justin


Yes, backup /etc/lvm periodically. As long as you have a copy of the
backup/archive diretories you can use that metadata to recreate any
corrupted metadata on disk.

Take a look at Red Hat's docs on the subject

http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5.4/html/Logical_Volume_Manager_Administration/mdatarecover.html

I want to say that I have read that vgcfgrestore should only be used
after you are *sure* you cannot get at the data on certain LVM vg/lv
or PVs (not sure which). The reason being is that it will remove
whatever it can't recover. The problem is that people see "recover" in
the command and use it first. I think the better

so make sure you recreate from backup first like this:
pvcreate --uuid "FmGRh3-zhok-iVI8-7qTD-S5BI-MAEN-NYM5Sk" --restorefile
/etc/lvm/archive/VG_00050.vg /dev/sdh1

that command is in those docs so if you read them thoroughly it should
explain that point I was making above.

John Brier