11-12-2007 07:30 PM
A. Add 4 new LUNs to each of the existing Adapters.
B. Add all 16 new LUNs on a 5th Adapter?
C. Split the 16 new LUNs equally over a 5th and a 6th Adapter?
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11-13-2007 12:05 AM
#B would be the preferred choice. 16 Luns per FC is the suggested maximum.
#A could be an option depending on the storage array; some newer storage arrays like XP1024/XP128 have their FC interface supporting 2Gbit per second throughput.
There is a very good article on Disk performance right here: http://jazz.external.hp.com/mpeha/papers/off_white
11-15-2007 02:48 AM
In theory, the more pathways (in this case, FC adapters) to datas you have, the better is the system performance.
I've seen some customers who use more than 16 LUNs per card and that does not seem to be an issue.
With the XP10000, you may want to try with option #A and monitor.
Note: Although adding extra FC card increases the number of "pathways to datas", be aware FC card management uses CPU cycles.