[THIN] Re: OT - MSCS quorum disks on a SAN
- From: Henry Sieff <hsieff@xxxxxxxxxxxx>
- To: "'thin@xxxxxxxxxxxxx'" <thin@xxxxxxxxxxxxx>
- Date: Sun, 29 Jun 2003 00:45:04 -0500
Well, I would definitely put all the quorum drives on the same mirrored
pair. I wouldn't worry about the egg-basket ratio on that. Both drives would
have the fail, and if it did, you could simply take down one node in each
cluster while you rebuilt quorum.
Having the quorum drives on their own RAID 1 group is what we do here, and
its never been a problem.
What SAN solutions are you looking at?
> -----Original Message-----
> From: Lee, David (CITY TREASURY) [mailto:David.Lee@xxxxxxxxxxxxxxx]
> Sent: Friday, June 27, 2003 8:46 AM
> To: Thin client listserve (E-mail)
> Subject: [THIN] OT - MSCS quorum disks on a SAN
>
>
> Judging by recent posts there are obviously quite a few
> people with a lot of
> MSCS and SAN experience on the list.....can anyone help with
> a question
> about dividing up disks in this environment?
>
> We currently have a project underway to implement some major new SQL
> applications, upgrade Exchange and replace multiple old
> Novell file servers,
> hence have been talking to various SAN suppliers and have got
> to the stage
> where we are receiving quotes and specifications. It has
> been determined
> that at least three Windows 2000 MSCS clusters will be
> required to support
> these services, with a possible later expansion for other
> applications. The
> leading supplier has quoted for a SAN with around 2Tb 'raw'
> storage, but
> obviously a chunk of this will not be useable due to meeting the
> requirements of RAID, hot spares etc.
>
> I have been told that standard practice is to assign most of
> the SAN disks
> to a RAID 5 array, which would be divided up into LUNs which will be
> assigned to the respective servers. However, I have also
> been told that
> Microsoft recommend the quorum drive of a cluster sit on a dedicated
> mirrored pair of disks, rather than assigning a LUN from this
> main RAID 5
> array. Obviously, with three clusters this would knock a
> further six disks
> off the usable storage space. However, the supplier has
> suggested to reduce
> cost that a single mirrored pair of disks could be
> partitioned to hold the
> quorums for all three clusters, which seems to me like too
> many eggs in one
> basket, mirrored or not!
>
> Sorry for the long winded explanation, I guess I can
> summarise by saying I'm
> really just trying to establish what is standard practice out
> there for
> implementing multiple MSCS cluster quorum disks on a SAN -
> any thoughts or
> ideas appreciated.
>
> Thanks in advance
>
> David Lee
>
>
> Systems Engineer
> City Treasury
> Plymouth City Council
> Civic Centre
> PL1 2AA
>
> Tel: (01752) - 304218
>
> DISCLAIMER
> "The views expressed in this message are personal and must
> not be considered
> to be the official views of Plymouth City Council."
>
>
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