Performance decrease after SP1 update

I've been seeing a similar problem with NSS volumes hosted on an iSCSI disk
array. Transfer rates from the NSS volumes on the array to the server's
local hard drive are around 3MB/s or less. Transfer rates from EXT2
formatted partitions on the array are more like 50MB/s.

Here's example timings writing from the NSS volume to the local disk with
NSS. bigfile is 1.4GB:
brain:/ # time cp /media/nss/DATA_VOL/bigfile .

real 6m54.681s
user 0m0.017s
sys 0m2.239s
brain:/ # time cp /media/nss/DATA_VOL/bigfile .

real 6m55.167s
user 0m0.031s
sys 0m2.171s

Here's results with an ext2 partition on the same array:
brain:/ # time cp /mnt/tmp/bigfile .

real 0m27.297s
user 0m0.145s
sys 0m10.775s
brain:/ # time cp /mnt/tmp/bigfile .

real 0m27.705s
user 0m0.132s
sys 0m10.629s

I've tested with NSS volumes on other iSCSI disk arrays, with the same
results. The owcimomd suggestion mentioned earlier had no effect.

Hardware is a dual processor IBM xSeries 335 w/ 1.5GB RAM.

I'd love to hear any suggestions.

Cheers,

A.

"Hein Konijn" <heinkonijn@myrealbox.com> wrote in message
news:5wkWe.7329$h61.7186@prv-forum2.provo.novell.com...
> Hi,
>
> I have tried it (sorry it took so long (busy,busy)), but to no avail, it
is
> still the same.
>
> Hein
> "Hein Konijn" <heinkonijn@myrealbox.com> wrote in message
> news:B0uVe.4147$h61.4105@prv-forum2.provo.novell.com...
> > OK, I will try and let you know.
> >
> > Hein
> > "Eric Young" <youngec@hotmail.com> wrote in message
> > news:1jhVe.3550$h61.1467@prv-forum2.provo.novell.com...
> > > 4.91 is not the latest. 4.91 SP1 is the latest
> > > (http://support.novell.com/cgi-bin/se...i?/2972119.htm).
> > 4.91 SP1
> > > was released at the same time as OES SP1, that is why I was thinking
it
> > would be
> > > worth updating.
> > >
> > > -Eric
> > >
> > > "Hein Konijn" <heinkonijn@myrealbox.com> wrote in message
> > > news:IO8Ve.3169$h61.128@prv-forum2.provo.novell.com...
> > > > Hi,
> > > >
> > > > I already have the client at 4.91.
> > > >
> > > > Hein
> > > > "Eric Young" <youngec@hotmail.com> wrote in message
> > > > news:mh1Ue.1387$h61.695@prv-forum2.provo.novell.com...
> > > >> It might be worthwhile to update the client (to 4.91 SP1)?
> > > >>
> > > >> -Eric
> > > >>
> > > >> "Hein Konijn" <heinkonijn@myrealbox.com> wrote in message
> > > >> news:nA0Ue.1289$h61.850@prv-forum2.provo.novell.com...
> > > >> > Hi,
> > > >> >
> > > >> > I have experimented some more, I found that the owcimomd process
> was
> > > > taking
> > > >> > all the CPU time when writing to the disk, after stopping this
> > process
> > > >> > writing to the disk is faster ~10MB/s, there is no change though
> when
> > > >> > reading from the disk.
> > > >> >
> > > >> > Hein
> > > >> > "Massimo Rosen" <mrosenno@spamcfc-it.de> wrote in message
> > > >> > news:431EC049.75E48454@spamcfc-it.de...
> > > >> >> Hi,
> > > >> >>
> > > >> >> Hein Konijn wrote:
> > > >> >> >
> > > >> >> > Hi,
> > > >> >> > I just tested it and it's even faster than I thought, I did a
> > > > "hdparm -t
> > > >> >> > /dev/hdd" the outcome was 52.76 MB/s.
> > > >> >> >
> > > >> >> > This server used to be a NetWare 6 server, and network
throuput
> > was
> > > >> > about
> > > >> >> > 20MB/s, the hardware hasn't changed since then, only installed
> > OES.
> > > >> >>
> > > >> >> Well, Netware *is* faster, and will always be. But it shouldn't
be
> > that
> > > >> >> bad. Let me see what I can find.
> > > >> >>
> > > >> >> CU,
> > > >> >> --
> > > >> >> Massimo Rosen
> > > >> >> Novell Support Connection Sysop
> > > >> >> No emails please!
> > > >> >> http://www.cfc-it.de
> > > >> >
> > > >> >
> > > >>
> > > >>
> > > >
> > > >
> > >
> > >
> >
> >
>
>