RAID1 or LVM quesiton

[gaf-mNDKBlG2WHs at public.gmane.org (Jerry Feldman)]

On 08/16/2010 04:30 PM, Bill Bogstad wrote:
> On Mon, Aug 16, 2010 at 3:53 PM, Jerry Feldman <gaf-mNDKBlG2WHs at public.gmane.org> wrote:
>  =20
>> We have a power failure here last week and one of my systems failed to=

>> come up with serious fsck issue on the boot drive:
>> I've got 3 SATA drives, 1 160GB boot and OS only
>> 2 2TB drives configured as either and LVM or possibly as a RAID1.  In
>> any case I resinstalled RHEL 5.3 and now I need to recover the volume
>> group and logical volumes. I tried vgchange, vgscan and pvscan with no=

>> results.  I may have used either LVM with mirroring or RAID1. I just
>> want to make sure I don't damage any data on the drives. The partition=
s
>> on both /dev/sdb and /dev/sdc are Linux LVM (8e).
>> I just don't want to do anything destructive at this point.
>>    =20
> You might try "mdadm -q /dev/sdXXX" on the partitions to see if they
> really are Linux RAID1 partitions.
> Also try "cat /proc/mdstat".
>
> I'm not sure about RHEL, but it is possible that if you didn't
> configure LVM/MD during the OS install that your initial ramdisk
> doesn't automatically load the kernel modules for the Linux MD
> drivers.  You might try loading the raid1 module manually and then
> re-checking /proc/mdstat.
>
> Good Luck,
> Bill Bogstad
>
>  =20
Thanks mdadm -q shows me that they are RAID1 /dev/md0.
I do so little RAID that I forget the commands and consequences.


--=20
Jerry Feldman <gaf-mNDKBlG2WHs at public.gmane.org>
Boston Linux and Unix
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