On Jan 21, 5:28 pm, Mike Christie <[EMAIL PROTECTED]> wrote:
> Miguel Gonzalez Castaños wrote:
> > Erez Zilber escribió:
> >> Hi,
>
> >> I'm running some performance tests with open-iscsi (iops & throughput).
> >> With open-iscsi over TCP, I see very low numbers:
>
> >> * iops: READ - 20000, WRITE - 13000
> >> * throughput: READ - 185, WRITE - 185
>
> >> In open-iscsi.org, I see much higher numbers. Did anyone measure
> >> open-iscsi performance lately? Can you share your numbers? Which
> >> iscsid.conf file did you use?
>
> >> Thanks,
> >> Erez
>
> > I'm having a HP AiO 600 Storage Server with SATA drives in RAID 5.
>
> > I have tried using open-iscsi and samba mounts and I'm getting around 10
> > MB/s of performance. I've asked in the HP forums:
>
> If I have not already, try this
>
> http://www.open-iscsi.org/bits/open-iscsi-2.0-868-test1.tar.gz
>
> I am not sure exactly why yet, but we found that with someone's setup we
> saw IO taking 6 or 7 seconds to get sent. With that tarball the problem
> is fixed and performance is normal.
Apparently there is a big difference between measuring with dd or
doing it with disktest. I know the latter is a raw disk test while dd
is testing it in the filesystem level but how come there are such big
differences?
I'm getting 40 MB/s in writes while disktest gets 100 MB/s in writes.
Another question, using RAID 1+0 with iSCSI targets could improve the
writes performance? The iSCSI server has RAID 5 and that makes the
performance really low: 100 MB/s writes 1000 MB/s for reads.
Thanks,
Miguel
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