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." > > > ******************************************************** > This weeks sponsor - RTOSoft TScale > Complaints about applications response time - DO SOMETHING ABOUT IT! > TScale 2.0 improves applications response time and increases terminal > server capacity. 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