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Mirrored Fabric Domain ID's
We have a mirrored/dual fabric configuration with multiple switches in each fabric. We have an odd and even fabric, with odd and even domain ID's for each switch.
The question is, does each domain ID in each fabric have to be unique? Or can both fabrics have a switch with domain ID 1, 2, 3, etc..? Someone told me that if the domain ID are the same, the fabrics will not merge if there is an ISL between them. Is that correct?
I think I explained this correctly...
Thanks
The question is, does each domain ID in each fabric have to be unique? Or can both fabrics have a switch with domain ID 1, 2, 3, etc..? Someone told me that if the domain ID are the same, the fabrics will not merge if there is an ISL between them. Is that correct?
I think I explained this correctly...
Thanks
JasonBailey
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February 12th, 2007 14:00
have to be unique? Or can both fabrics have a switch
with domain ID 1, 2, 3, etc..?
What dynamox said is correct.
However, one thing to be aware of is that you may get duplicate fibre channel address (FCIDs). Which is not going to stop anything working, but it can be confusing, especially to the support centre when we are trying to figure out what is plugged in where from an emcgrab or emcreports output!
e.g. If you plugged your 2 HBAs into 2 McData switchs which each had domain ID of 1 and you used port 1 on both (most people use same port for simplicity) then your FCIDs would be identical. The domain ID makes up the first 2 digits of the FCID. If you were getting SCSI errors, the first step would be to figure out which HBA is getting the errors and we would look at its FCID to figure out the domain ID of the fabric which needs to be investigated. In this situation its a little confusing, but not a showstopper since we still have WWNs.
dynamox
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February 12th, 2007 12:00
dynamox
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February 14th, 2007 11:00
Thanks
Allen Ward
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February 14th, 2007 11:00
If you have your switches set to a Preferred Domain ID and the Insistent checkbox checked off the switch will always want to be that ID number. But this may or may not matter since you have to take the switch offline to change the preferred Domain ID anyway.
If you want to merge two fabrics together you just have to make sure that the switches are set to different IDs when the actual merge occurs. This may require taking one fabric down and back up again before the merge can occur.
dynamox
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February 14th, 2007 11:00
Allen Ward
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February 14th, 2007 11:00
I've never actually tested this out though. Too hard to get budget for a test lab
Allen Ward
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February 14th, 2007 13:00
I guess we would have to try that out in our multi-million dollar state of the art SAN lab
JasonBailey
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February 14th, 2007 23:00
So when you put the Brocade switch into interop, it needs to accomodate this McData restriction. The Brocade will add 60h to the domain you specified, convert to dec.
Allen Ward
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February 15th, 2007 06:00
As for dynamox's math question, I think the offset works as a base so that with an offset of 96 (h60) a preferred Domain ID of 1 is actually 96 (h60)... 2 would be 97 (h61)... and so on.
dynamox
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February 15th, 2007 06:00
dynamox
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March 1st, 2007 19:00