> -----Original Message-----
> From: iscsitarget-devel-admin@xxxxxxxxxxxxxxxxxxxxx
[mailto:iscsitarget-
> devel-admin@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of FUJITA Tomonori
> Sent: Saturday, January 28, 2006 5:43 PM
> To: Scott Harrington
> Cc: iscsitarget-devel@xxxxxxxxxxxxxxxxxxxxx
> Subject: Re: [Iscsitarget-devel] Great read performance, bad write
> performance - help?
>
> From: "Scott Harrington" <sharrington@xxxxxxxxxxxx>
> Subject: [Iscsitarget-devel] Great read performance, bad write
performance
> - help?
> Date: Fri, 27 Jan 2006 12:55:18 -0800
>
> > Hello everyone. I am new to this list, so please accept my apology
if
> > this has been covered at some point in the past (I did check
archives
> > though). Also, I hope this is the correct place for this.
> >
> > I don't even know if my problem is IETD specific, but I'm fresh out
of
> > ideas. I will try to include as much information as possible, while
> > attempting to keep it relevant. I've been trying to solve this
problem
> > for going on two months now with no luck.
>
> Generally speaking, the read performance is not good because IET uses
> write-through disk cache policy. You can try the following patch
> though I recommend you to read the past discussions. This issues have
> been discussed several times.
>
>
> Index: kernel/file-io.c
> ===================================================================
> --- kernel/file-io.c (revision 27)
> +++ kernel/file-io.c (working copy)
> @@ -264,7 +264,6 @@
> .name = "fileio",
> .attach = fileio_attach,
> .make_request = fileio_make_request,
> - .sync = fileio_sync,
> .detach = fileio_detach,
> .show = fileio_show,
> };
Thank you very, VERY much! I think the problem has now been solved
without having to switch initiators. I'm currently getting over
1,000MB/min writes now. I would love to increase it further, but I'm
extremely happy with it as it is. I'm not overly concerned with bad
writes as all the backup jobs I send to the iSCSI SAN are verified after
the job completes.
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