[THIN] Re: OT - MSCS quorum disks on a SAN
- From: "Lee, David (CITY TREASURY)" <David.Lee@xxxxxxxxxxxxxxx>
- To: "'thin@xxxxxxxxxxxxx'" <thin@xxxxxxxxxxxxx>
- Date: Mon, 30 Jun 2003 11:22:50 +0100
John, thanks for that, well worth knowing it isn't necessarily plain
sailing!
-----Original Message-----
From: Rowlandson, John [mailto:John.Rowlandson@xxxxxxxxxxxxx]
Sent: 30 June 2003 11:01
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: OT - MSCS quorum disks on a SAN
Mallesons Stephen Jaques
www.mallesons.com
Confidential communication
we bought them for cx600 primary (8tb) and cx400 (6Tb)for secondary or
disaster recovery
we bought mirroeview as emc/dell told us it will do queue'd replication
but alas ot only does synchronous where host in primary has to wait for for
write in DR disk which is no good in aus with slowlinks
they also said we can do a clone and then use mirrorview that to Dr but it
turns out you cant do that either..
we had already spent a lot of $$$ on fibre to IP routers at that stage..
now doing log shipping, and exchange backups and restores or logs and
replaying them at DR to keep off line consistent DB's in DR....
. in essence its not as easy as they say. we are 6 months into the
project...
John Rowlandson
Technical Support Specialist
Mallesons Stephen Jaques
Sydney
T +61 2 9296 3653
F +61 2 9296 3676
john.rowlandson@xxxxxxxxxxxxx
-----Original Message-----
From: Lee, David (CITY TREASURY) [mailto:David.Lee@xxxxxxxxxxxxxxx]
Sent: Monday, 30 June 2003 7:46 PM
To: 'thin@xxxxxxxxxxxxx'
Subject: [THIN] Re: OT - MSCS quorum disks on a SAN
John
Was the CX400 at your secondary data centre implemented for disaster
recovery purposes? In which case, are you using mirrorview to replicate
data to the secondary, and is it really as simple and painless as Dell tell
me?
Thanks in advance
Dave Lee
-----Original Message-----
From: Rowlandson, John [mailto:John.Rowlandson@xxxxxxxxxxxxx]
Sent: 30 June 2003 09:56
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: OT - MSCS quorum disks on a SAN
Mallesons Stephen Jaques
www.mallesons.com
Confidential communication
the new cx's are good
we have a cx600 and a cx400 in primary and secondary data centres
John Rowlandson
Technical Support Specialist
Mallesons Stephen Jaques
Sydney
T +61 2 9296 3653
F +61 2 9296 3676
john.rowlandson@xxxxxxxxxxxxx
-----Original Message-----
From: Lee, David (CITY TREASURY) [mailto:David.Lee@xxxxxxxxxxxxxxx]
Sent: Monday, 30 June 2003 6:24 PM
To: 'thin@xxxxxxxxxxxxx'
Subject: [THIN] Re: OT - MSCS quorum disks on a SAN
Thanks for that, I'm probably just being paranoid after a nasty experience
with an MSCS quorum disk on an earlier SAN! We use a lot of Dell servers
here and they are looking favourite to supply the complete hardware
solution, which of course means we will get EMC equipment for the SAN,
probably the CX400.
-----Original Message-----
From: Henry Sieff [mailto:hsieff@xxxxxxxxxxxx]
Sent: 29 June 2003 06:45
To: 'thin@xxxxxxxxxxxxx'
Subject: [THIN] Re: OT - MSCS quorum disks on a SAN
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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