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colinwilson
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April 21st, 2009 02:00
Maximum LUN IDs - different hosts
Hi All,
I would like to know what the maximum LUN IDs each type of host can handle, e.g:
Windows = 255 (0FF).
I am fairly certain HP-UX is 512 - however HP-UX count LUN IDs completely differently from other hosts.
But I really want to know about Solaris - I have a feeling it is the same as Windows and can only handle up to 255 or 0FF but would like to know for certain???
I have a Solaris server presented to two FA's and the first available address is 0FD on both and I have 5 LUNs to present. If my thoughts on the max LUN address are true it will mean I will need to use LUN offsetting which is relatively easy but would prefer not to have to do that if at all possible. Using different FA's is not really an option for me.
I would like to know what the maximum LUN IDs each type of host can handle, e.g:
Windows = 255 (0FF).
I am fairly certain HP-UX is 512 - however HP-UX count LUN IDs completely differently from other hosts.
But I really want to know about Solaris - I have a feeling it is the same as Windows and can only handle up to 255 or 0FF but would like to know for certain???
I have a Solaris server presented to two FA's and the first available address is 0FD on both and I have 5 LUNs to present. If my thoughts on the max LUN address are true it will mean I will need to use LUN offsetting which is relatively easy but would prefer not to have to do that if at all possible. Using different FA's is not really an option for me.
1261
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Posted April 21st, 2009 02:00
I don't think you can actually use 0FF on windows. FE is the highest usable number on Win2k3R2 AFAIK.
Message was edited by:
RRR
Sorry about this.... It seemed my 1st copy of the post didn't come through1261
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Posted April 21st, 2009 04:00
For Emulex native drivers on Solaris:
The Solaris configuration file /kernel/drv/sd.conf should contain all Targets and LUNs that a user may want to access. Devices accessed via Emulex Fibre Channel adapters and Emulex driver can be up to 512 Targets with a maximum of 256 LUNs per target.
I'll go dig out what the maximums are for Sun Leadville driver too....1261
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Posted April 21st, 2009 04:00
Conor,
I had a dim and distant thought lurking at the back of mind that said solaris can handle up to 512 but I wasn't sure if that was just wishful thinking.
Thanks for the help - makes my provisioning that little bit easier.1261
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Posted April 21st, 2009 04:00
From doing a bit of "Googling" it seems that the Leadville driver is rumored to support a theoretical maximum of 16,000 devices/target... I can't find any actual documentation to support this at the moment... will keep looking!1261
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Posted April 21st, 2009 04:00
Uhm... don't know. Dynamox should know, he's our Solaris guru... I think.1261
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Posted April 21st, 2009 04:00
Cheers for the response and although I want to know about the LUN ID Maximums for all hosts, I really need to know what the max is for Solaris.1261
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Posted April 21st, 2009 04:00
Yep - found it finally - Max number of Luns per target using Leadville driver...
The number of LUNS per target for QLogic HBAs has now been increased to support a maximum of 16K
http://wikis.sun.com/display/SFSRelNotes/Sun+StorEdge+SFS+4.4.14+Release+Notes694
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Posted April 21st, 2009 09:00
HBA support 16K? Does the host support too??173
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Posted April 21st, 2009 22:00
I hope so
I've personally seen solaris hosts (with leadville drivers) using luns over 0xff (255). I guess they don't lie
RRR
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1261
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Posted April 21st, 2009 02:00