performance tuning of iSCSI and Dell MD3000i / gjournal problem

[Ivan Voras]

On 01/26/10 17:16, Miroslav Lachman wrote:
> I am CCing freebsd-performance at freebsd.org as somebody may be interested
> and not subscribed to freebsd-scsi.
>
> Just a note, I am still having performance problems with iSCSI and Dell
> MD3000i.
> I tried it with ZFS, but writing performance was even worse - about
> 3-5MB/s! Copying 33GB from local UFS partition do iSCSI ZFS partition
> takes almost 5 hours:

You've written a lot of information here. Firstly, is your problem 
related to iSCSI performance, ZFS performance or UFS performance? As it 
looks to me, you are mostly complaining about iSCSI performance, right?