Another possibility is the queue depth specified on the driver.

How many disks do you have behind the LUN on the filer? A good rule of thumb is: anything below 1 outstanding IOP per physical disk is ok.

Since this is iSCSI, it may also be a networking problem...

Glenn

-----Original Message----- From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Blake Golliher Sent: Saturday, January 14, 2006 12:50 AM To: David Lee Cc: toasters@mathworks.com Subject: Re: iSCSI to NetApp

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. :