How full is the aggregate/volume hosting the LUN? Could be WAFL performfance due to (nearly) full disks. In our development system I setup some several LUNs in different volumes on the same aggregate resulting in an aggregate that was 97% full -- to say the least, performance was horrible. Reconfigured to several smaller aggregates with no volume or aggregate > 90% full and performance went up dramatically. This is all using Microsoft's iSCSI initiator. You may also want to consider testing using software initiator vs hardware initiator. From what I've read and seen in some earlier testing I've done, the software initiator performed as well or better than the hardware initiator for MUCH less cost.
-----Original Message----- From: owner-toasters@mathworks.com [mailto:netbacker@gmail.com] Sent: Friday, January 13, 2006 1:41 PM To: David Lee Cc: toasters@mathworks.com Subject: Re: iSCSI to NetApp
How big is the volume where the LUN resides? Is it on a seperate volume or on a heavily used one. Not enough spindles maybe? What model of filer? Could there be a routing/switching issue? Jumbo frames issue? I haven't used a TOE/iscsiHBA for a long time now, not worth the price. Standard Gig-E cards with Microsoft iSCSI drivers has been working great for us. Not much of a CPU hit. easiy to troubleshoot.
If you have a spare NIC, why don't you try swapping the HBA with it and try MS iSCSI drivers to troubleshoot and check performance. -G
On 1/13/06, David Lee t.d.lee@durham.ac.uk wrote:
(System: ONTAP 6.5.5)
We have a Windows 2003 server (SP1) which uses iSCSI to mount a drive onto a NetApps filer.
When transfering files the performance is very poor: it can take 5 minutes to transfer a 350 Mbyte file. Looking at Performance Monitor on Windows while a file transfer is taking place shows that Disk Queue Length readings can reach: Average=94, Maximum=2142
We are using a QLogic QLA4010 Host Bus Adapter with the latest firmware (3.0.0.4) and driver (2.1.0.8).
Any ideas? Thanks in advance.
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