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Need help setting up the physical connection to a SAN

Posted on 2008-06-19
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Hi, We currently have an HP Fail over Cluster using an MD1000.  Our Co-Lo vender has sold us an option to setup a SAN using their storage with our server.   Unfortunately they don't appear very bright and haven't been able to help in setting up a connection.

Servers are HP DL-380 G3
OS Windows 2003 SP2
Cluster is Hot Standby (Active/Passive)

We can connect fine to their SAN, but the cluster servers see 2 different LUN's.   Having never done this before, I'm assuming that when I configure the SAN, (before placing it in the cluster resource), both should share or see the same LUN just like a shared folder on a file server. (but I'm guessing).

We are using QLogic's iSCSI HBA's, and the backend server storage is an is707 Silicon Mechanics StorForm server. (the Co-Lo's)    I've configured the server to see the SAN just fine, but it appears to be 2 different LUN's, versus both talking to the same LUN.

One thing I did notice (which is probably why they see 2 different LUN's) is that the IP addresses are different.

If you've done this in the past and are willing to help, I'd be greatful!!!.

Bill
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Question by:wsaharem
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Expert Comment

by:Giuseppe "Pino" De Francesco
ID: 21829316
I assume here we have a iSCSI over IP, right? I miss a point: how can the IP be different?

Cheers
Pino
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by:andyalder
ID: 21829695
There is presumably a redundant path/controller so although you see 2 LUNS they are the same physical disk. MPIO is normally the product to sort that out but that comes from the SAN manufacturer rather than direct from Microsoft. May have their own redundant path software.

Your co-lo can probably supply a copy or tell you where to download it from since it's their SAN.
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by:wsaharem
ID: 21831330
gdefrancesco, I agree, the IP's being different didn't make sense.    I did some work on it a short while ago and changed the IP's to the same one.   Once I saved the configuration, A see's the lun, but B won't start a session.

andyalder,  No, they were really different.  I wrote files to it from A and B with different names, and when looking at A, it didn't show B's file and visa-versa.      Would Multi-Path come from the SAN vendor, or would I use QLogic's ??
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by:andyalder
ID: 21832186
Multi pathing software comes from the SAN vendor but if the files were different then its not a duplicate path problem. The IP addresses are normally different since two controllers are used in the iSCSI SAN box normally, sounds like they have tried to implement redundant paths but ended up presenting 2 seperate LUNs out.
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wsaharem earned 0 total points
ID: 21868346
A SAN cannot have two servers directly mounting the same LUN.   It's similiar to two computers trying to share the same disk drive.     The 2 Clustered servers need to be setup independantly and then the cluster software will manage when the LUN is mounted to which server.
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