(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.
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.
--
: David Lee I.T. Service : : Senior Systems Programmer Computer Centre : : Durham University : : http://www.dur.ac.uk/t.d.lee/ South Road : : Durham DH1 3LE : : Phone: +44 191 334 2752 U.K. :
David,
Take a perfstat, and I'd be happy to take a look at look at it, and help if I can.
-Blake
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.
--
: David Lee I.T. Service : : Senior Systems Programmer Computer Centre : : Durham University : : http://www.dur.ac.uk/t.d.lee/ South Road : : Durham DH1 3LE : : Phone: +44 191 334 2752 U.K. :
On Fri, 13 Jan 2006, David Lee 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.
Many belated thanks to those who replied to the query.
My colleague, on whose behalf I was asking, has now tried bypassing (avoiding) the Adapter. This seems to have cured the problem. (He's still not sure whether it is the Adapter itself, or our local use of it, which underlies the problem.)
Thanks again for your replies.
-
Blake Golliher -
David Lee -
Sto Rage©