[DRBD-user] Trouble getting RAID5 on top of DRBD to work..

Sören Malchow Soeren.Malchow at interone.de
Mon Jun 2 16:30:17 CEST 2008


Hi,

i did not try that before ( with RAID 6 ) but may i suggest using CLVM 
together with the Redhat Cluster Suite on top of DRBD, put both drbd nodes 
in primary and run a cluster with GFS2 on top of that.

That should do the Job, we have a setup like that running with plain ( no 
RAID ) lvm volumes, since we have a hardware RAID 

Cheers
Soeren





Tim Nufire <tnufire at ibink.com> 
Sent by: drbd-user-bounces at lists.linbit.com
02.06.2008 16:26

To
drbd at bobich.net
cc
drbd-user at lists.linbit.com
Subject
Re: [DRBD-user] Trouble getting RAID5 on top of DRBD to work..






Yes, I failed over the nodes.. (see my original post for full 
details). I have everything working perfectly with LVM on top of DRBD 
and was hopping RAID6 on top of DRBD would be similar. The problem is 
that the RAID signatures don't appear to be mirrored, perhaps because 
they are in super blocks and not part of the data DRBD replicates... 
Don't know.

Also, from this thread and related research online, DRBD based RAID16 
does not appear to a configuration that anyone else has tried.... 
Never good to be the first ;-)

Tim

On May 30, 2008, at 10:12 AM, drbd at bobich.net wrote:

> On Fri, 30 May 2008, Tim Nufire wrote:
>
>> What I really want is RAID16 since it has incredible reliability 
>> along with the low impact failure modes of RAID1/RAID10... Which 
>> brings me back to my original question.... Can I create a RAID6 
>> array on top of DRBD devices. I already have the DRBD mirrors setup 
>> and know how to create RAID10 using LVM. I can use mdadm to create 
>> a RAID5/6 array on top of DRBD volumes and everything works on the 
>> initial node. The problem is that I can't assemble the array on the 
>> mirrored node :-/
>
> Have you failed the DRBD devices over to the backup node before re- 
> assembling the array (e.g. by shutting down the primary node)? If 
> you are running in primary/secondary, the secondary devices won't 
> work until they become primary.
>
> I don't think you can run DRBD in primary/primary if you are running 
> md on top.
>
> Gordan
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> drbd-user at lists.linbit.com
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