I am currently installing a couple of Hitachi AMS 2100 SANs for presenting storage to ESX. The stripe size options for creating RAID5 LUs on the AMS are 64/256/512kb, with 256 being the default. Does it make a great deal of difference which is selected, what would be the best performance for ESX? Also is there any configuration required in ESX to ensure best performance? Thanks
I came across this looking for the same question you are. I asked around and the answer I got was "the default of 256k is the best for 99% of cases, especially with VMware VMFS partitions". The only time we would consider deviating from this is in a situation where we have a very predictable large sequential block workload (not typical with VMware VMFS') and possibly with things like video streaming where the controllers were struggling to write the data quick enough.
I hope this helps others looking for the same info.