Ross,
I don't know if it's my network setup or what at this point, but
during my benchmarks I am unable to get more then 20-23MB/s doing 4k
sequential reads with 4 outstanding I/Os. This is constant whether
going to a ZVOL or a soft partition.
My setup:
Server: Dell PE 2950, 2 quad xeons, 4GB memory, 2 on board bnx
(management network only), intel quad igb running LAG to a layer 3
switch, flow control and jumbo frames enabled, Solaris 10 update 7
with all the latest patches installed. Storage is 14 SAS 15k in a
MD1000 enclosure hooked up to a Dell PERC 6e w/ 512MB of BBU write-
back cache, disks setup as individual RAID0 disks, then put in a
zpool as 2 raidz2 sets of 7 drives each. I have the write-back
enabled on each disk for ZIL performance since I don't have an SSD
disk for ZIL logging.
Client ESX windows 2003r2 guest running MS ini 2.08.
I believe the switch and the ESX are setup properly tests against a
Linux host running IET and HW RAID6 show it's capable of around
30-40MB/s.
Any feedback on this would be appreciated as I am getting a little
burnt out trying to diagnose this.
Getting 20-23MB/s doing 4k sequential reads is between 5K to 6K IOPS.
These being constant going between ZVOL or soft partition, I would
have to surmise that CPU performance is likely one of your limiting
factors. What is the CPU cost of the iSCSI Target Daemon (iscsitgtd)
while driving this I/O load?
If you are measuring 20-23MB/s performance on the iSCSI Client side,
what is the iSCSI Target's I/O performance in accessing the ZVOLs or
soft partitions? Specific to comparing iSCSI client and target
performance, does the work load performance change, as the I/O size
changes?
- Jim
-Ross
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