<br><font size=2 face="sans-serif">Hi,</font>
<br>
<br><font size=2 face="sans-serif">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.</font>
<br>
<br><font size=2 face="sans-serif">That should do the Job, we have a setup
like that running with plain ( no RAID ) lvm volumes, since we have a hardware
RAID </font>
<br>
<br><font size=2 face="sans-serif">Cheers</font>
<br><font size=2 face="sans-serif">Soeren</font>
<br>
<br>
<br>
<br>
<br>
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<td width=40%><font size=1 face="sans-serif"><b>Tim Nufire <tnufire@ibink.com></b>
</font>
<br><font size=1 face="sans-serif">Sent by: drbd-user-bounces@lists.linbit.com</font>
<p><font size=1 face="sans-serif">02.06.2008 16:26</font>
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<div align=right><font size=1 face="sans-serif">To</font></div>
<td><font size=1 face="sans-serif">drbd@bobich.net</font>
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<td>
<div align=right><font size=1 face="sans-serif">cc</font></div>
<td><font size=1 face="sans-serif">drbd-user@lists.linbit.com</font>
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<td>
<div align=right><font size=1 face="sans-serif">Subject</font></div>
<td><font size=1 face="sans-serif">Re: [DRBD-user] Trouble getting RAID5
on top of DRBD to work..</font></table>
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<td></table>
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<br>
<br>
<br><tt><font size=2>Yes, I failed over the nodes.. (see my original post
for full <br>
details). I have everything working perfectly with LVM on top of DRBD <br>
and was hopping RAID6 on top of DRBD would be similar. The problem is <br>
that the RAID signatures don't appear to be mirrored, perhaps because <br>
they are in super blocks and not part of the data DRBD replicates... <br>
Don't know.<br>
<br>
Also, from this thread and related research online, DRBD based RAID16 <br>
does not appear to a configuration that anyone else has tried.... <br>
Never good to be the first ;-)<br>
<br>
Tim<br>
<br>
On May 30, 2008, at 10:12 AM, drbd@bobich.net wrote:<br>
<br>
> On Fri, 30 May 2008, Tim Nufire wrote:<br>
><br>
>> What I really want is RAID16 since it has incredible reliability
<br>
>> along with the low impact failure modes of RAID1/RAID10... Which
<br>
>> brings me back to my original question.... Can I create a RAID6
<br>
>> array on top of DRBD devices. I already have the DRBD mirrors
setup <br>
>> and know how to create RAID10 using LVM. I can use mdadm to create
<br>
>> a RAID5/6 array on top of DRBD volumes and everything works on
the <br>
>> initial node. The problem is that I can't assemble the array on
the <br>
>> mirrored node :-/<br>
><br>
> Have you failed the DRBD devices over to the backup node before re-
<br>
> assembling the array (e.g. by shutting down the primary node)? If
<br>
> you are running in primary/secondary, the secondary devices won't
<br>
> work until they become primary.<br>
><br>
> I don't think you can run DRBD in primary/primary if you are running
<br>
> md on top.<br>
><br>
> Gordan<br>
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