Thanks AreEss
So here what I did:
set logicaldrive["DS3400L01"] cacheFlushModifier=immediate;
set logicaldrive["DS3400L01"] mirrorEnabled=false;
set storagesubsystem cacheFlushStart=0;
set storagesubsystem cacheFlushStop=0;
Can it be more agressive than that apart completly disabling cache ...
Thanks
in fact, communication between the controller seems to be the culprit.
with mirrorEnabled=false and writeCacheEnabled=true : 11000 I/O
with mirrorEnabled=false and writeCacheEnabled=false : 2400 I/O
Would it be that the system doesn't even try to mirror the data ?
Or maybe it...
DS3400 with 2x 512M controllers
cacheBlockSize=16 and segment size of 128k
Raid6 11 300GB 15k SAS disks + 1 spare
ESX-3.5U4 and a windows 2003 SP2 VM
iometer 32k 100% writes and 100% random
With mirrorEnabled=true we have 2900 I/O per second
With mirrorEnabled=false we have 9300 I/O per...