> From: David Weibel > Sent: Tuesday, June 19, 2007 9:49 AM > > 1) Are there Errors. Checked /var/adm/messages for any type > of errors during your IO run. Check netstat for network errors > and collisions.
No errors and the network is idle except for this traffic (test lab for storage exclusively.) > 2) Simplify the Problem. Take ZFS out of the picture. I'm Since posting the other day, I have done this. Performance on the network is broken in some way, even after setting jumbo frames. I am investigating this now. Now that the 10GbE and switch are configured with jumbo frames (9198 on switch and 9000 on T2000/X4500 systems) I am still experiencing slow performance across the network. - iscsi targets capable of 350+ MB/s local on X4500 give 20 MB/s T2000->X4500 - java TTCP on 10GbE -> 110 MB/s and 4x1GbE -> 90 MB/s (10GbE -> 16000 p/s and 4x1GbE -> 10000 p/s with both boxes < 5% utilized) Apparently the problem is (mostly) on the t2000... the numbers for X4500->X4500 are better. (I say mostly because it a little more than half what I would expected on 10GbE/PCI-X.) - java TTCP on 10GbE -> 325 MB/s and 4x1GbE -> 95 MB/s I appreciate the pointers to the iscsi/network tuning items and will work to incorporate them into the testing. Will report back when I resolve the network problem and apply this information. -- paul
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