I've not had a chance recently to run performance numbers using real
disks as the backing store.
Recently some hardware was made available to me, but I've not had a
chance to run any performance testing because of other tasks. I'll
see if I can make some time available tonight.
Could you answer a couple of questions for me.
(1) What size I/O are you doing to the target?
(2) Are the builds from OpenSolaris? If so, I need to
determine if these are debug builds or not. I've
seen similar results when I run a machine with the
debug bits.
(3) Before your run did you happen to boot the machine
using the -r option to boot. e.g. 'reboot -- -r'
This too will kill performance.
(4) What benchmark are you using for iSCSI and NFS?
On Oct 10, 2006, at 3:48 AM, Ben Rockwood wrote:
Can anyone provide an example of a best-case iSCSI Target
configuration? Preferably with accompanying performance data.
Right now I'm really stuck. I need to put iSCSI into production.
I've
got a 24TB, 4 Core 2.4Ghz Opteron, 16GB RAM Thumper sitting here as a
target and an X4100 4 Core 2.4Ghz Opteron 16GB as an initiator. The
Thumper was loaded fresh with B49 this morning, the X4100 is running
B43. I push the ZFS pool in excess of 400MB/s local... I can't eek
more
than 30MB/s out of it via iSCSI despite the fact that I've got 2
gigabit
(e1000g) ports aggregated. I can push NFSv3 above 100MB/s without
tuning so long as I disable ZIL.
The only place I'm guilty for the moment is that I'm not using
JumboFrames. I'll enable those in the next couples days. Based on an
earlier post that might be whats killing me. Is that possible? I
never
used JumboFrames with NetApp Filers and performance was excellent.
If this config can't pull big numbers of out the iSCSI Target I don't
know what can. Suggestions on how to make this thing sing would be
helpful.
The follow up is with regards to memory consumption. I created a
100GB
ZVol for backing store and ran some benchmarks against it... the
target
RSS went above 7GB.
benr.
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----
Rick McNeal
A good friend will come and bail you out of jail ... but, a true
friend will be sitting next to you saying, "Damn ... that was fun!"
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