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Re: [Linux-cluster] RAID1 in RHCS / RHEL5



Hi GOrdan,

Thanks for your reply.

I had thought about DRBd, but would rather not mirror over network links, when I can mirror over the SAN. I am also not sure how DRBD would handle our running a Postgresql database on top of it, having never used DRBD in production. Do you have any experience with databases on DRBD?


Thanks,

Ivan.

On Jul 27, 2011, at 2:05 AM, Gordan Bobic wrote:

> I don't think this has anything to do with clustering, but what you are 
> probably looking for is DRBD:
> http://www.drbd.org/
> 
> Gordan
> 
> On Tue, 26 Jul 2011 23:47:03 -0600, Ivan Fetch <ifetch du edu> wrote:
>> Hello,
>> 
>> I am not finding a lot of docs or commentary about accomplishing
>> RAID1 of two shared storage (FC SAN) LUNs, in RHCS. I wlikd like to
>> RAID1 two mpath devices (using the device multipathing with RHEL5).
>> The mpath devices (mpath0, mpath1) do not match up on all nodes, but 
>> I
>> don't believe this technically matters, since md uses UUIDs to 
>> detects
>> it's disk devices.
>> 
>> I could just configure an md device, but it seems like there should
>> be a notion of which node owns the md. WHat happens when the active
>> node is resyncing a mirror, and that node dies or gets fenced? WHat
>> happens if someone tries to operate on the md from the inactive node?
>> 
>> I would very much appreciate hearing from those who are accomplishing
>> this, how they did it, gotchas and lessons learned.
>> 
>> Thanks,
>> 
>> - Ivan
>> 
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>> --
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> 
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