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Poweredge 2900 running 2xDC Xeon, 10GB RAM, 6x7200RPM 2TB Drives, Perc6 w/512MB cache, RAID 10.
Chelsio 10GBE adapters at both ends ESX 4.1.
Currently, reads are only 150MB /sec, writes are 330/MB at 512k from inside a Windows VM. These drives in the same config will push 700MB/sec locally.
4k are 16/17 respectively.
The read writes seem backwards.....and I must be off in tuning something. I've followed the 4.1 guide and set all the params....they didn't do a thing.
Any ideas?
check array write caching, and read caching is enabled.
can try some tweaks on targets too:
1. From the console, press CTRL+ALT+W,
2. Select Tuning options -> iSCSI daemon options -> Target options,
3. Select the target in question,
4. change the MaxRecvDataSegmentLength and MaxXmitDataSegmentLength values to the
maximal required data size (check w/ the initiator to match).
maxRecvDataSegmentLen=262144
MaxBurstLength=16776192
Maxxmitdatasegment=262144
FirstBurstLength=65536
DataDigest=None
maxoutstandingr2t=8
InitialR2T=No
ImmediateData=Yes
headerDigest=None
Wthreads=8
make sure the software initators in vmware match these settings too.
can also up to jumbo frames on the cards.
Yup already done. Its the read/write disparity that has me confused....Quote:
Originally Posted by Gr-R
So still getting VERY poor read performance. Write performance is very good.Quote:
Originally Posted by dwright1542
Does ANYONE have an idea, or do I go back to Openfiler? (I've now tried DSS 3 times, and have ended up back at OF every time)