[ILUG] iSCSI Woes

[Conor Wynne]

On 07/02/2007 23:01, "AJ McKee" <aj.mckee at gmail.com> wrote:
> Hi all,
> 
> I have a Novell OES install here. I was using Qlogic QLA HBA's to
> connect to an iSCSI storage device, however it was causing no ends of
> problems, such as hanging the server etc.
> 
> Anyhow, I have configured normal iSCSI on OES but the performance of
> it is bad too. No it does not crash the server, in fact it works well
> and I have not gotten any errors there. But in terms of speed, it is
> very very slow. Granted the TCPOE on the QLA4010 would be great to
> have working now, but alas that is not the case.
> 
> It took 10 min to copy 8GB data from the localhost to the storage
> device. I am just doing a mkfs.ext3 now and my load has shoot right up
> (load average: 4.01, 3.00, 1.46) from 0, 0, 0. It was worse when I was
> copying files.
> 
> There is no other traffic on the iscsi network (GigE) at the moment
> apart from this test server. I am wondering if this is normal. I have
> tested this win windows 2003 srv and the qlogic hba and the
> performance appears much faster.
> 
> Is there something I am doing wrong here or some tweaks I can perform
> to increase performance.
> 
> Hardware info below;
> 
> Any help welcomed.

You may wish to look at changing the kernel to hugemem :

HighFree:      7064528 kB
LowFree:          5792 kB

Tons of unused highfree compared to lowfree.

Just a guess but worth a simple test.

> Cheers
> AJ

Regards
Conor.