|
[Veritas-bu] RE: perfomance problem using Sun E450 with SDLT drives
2003-08-08 15:29:50
This is a multipart message in MIME format.
--=_alternative 006B199686256D7C_=
Content-Type: text/plain; charset="US-ASCII"
i had a freaky scsi problem. I managed to confirm it with scsiinfo from
http://www.cs.toronto.edu/~jdd/
the channel was only sync'ing up at 5mb/s.
I rebooted the box and that seemed to fix the problem.
veritas-bu-admin AT mailman.eng.auburn DOT edu wrote on 08/08/2003 11:10:35 AM:
> Hello dennis
>
> Iam using an E450 with 4 processors. also I have been running this for
> quite a while.This server is my master server and i began to notice
> performance issues only after significant increase in my catalog data.
> I ran a couple of tests
> i did a simple tar tests to all the 4 drives at the same time and
> iam seeing same slow performance with tar also.
>
> Then i did a tar of a huge directory to /dev/null and this completed
with
> 30MB/sec.That means that the O.S. seems to working fine.
>
> Iam unable to find whether the problem is with the scsi subsystem or
with
> the controller card
>
>
> Thanks
> vR
>
>
> On Fri, 8 Aug 2003, Dennis Dwyer wrote:
>
> > A couple of questions first.
> >
> > How many processors in your E450?
> >
> > Did you just implement SDLT220 drives or have you been running them
awhile?
> >
> > If you didn't just implement them, have they been running
> satisfactorily and then all of a sudden started running badly?
> >
> > The reason I ask is I was considering adding SDLT drives to my
> L700 library last year (there were 8 DLT8000's in there). The vendor
> (STK) was adamant about the fact that for SDLT you need to have one
> processor per tape drive in order to take full advantage of its
> performance. Perhaps someone can confirm or deny that fact for me
> but that's was the party line from STK as recently as last October.
> >
> > So ... If you just implemented the drives and you're running 4
> SDLT drives on a base E450 with two 400Mhz CPU's, that could be a
> problem for you. Obviously this reasoning might not apply if they
> had been running well and all of a sudden the performance problem
> started (unless you had a significant increase in the amount of data
> you're transferring).
> >
> > Regards,
> > Dennis
> >
> > Dennis F. Dwyer
> > Manager, Systems Software
> > Tampa Electric Company
> >
> > (813) 225-5181 - Voice
> > (813) 275-3599 - FAX
> >
> > Visit our corporate website at www.tecoenergy.com
> >
> > The Colonel Says: "Time is not a test of the truth"
> > Translation: Just because you've always done it that way, doesn't
> make it right
> >
> > >>> Vijaykumar Rajendra Rao <vrajendr AT mipos2.intel DOT com> 08/07/2003
> 12:52:04 PM >>>
> >
> > hello all
> >
> > i have a sun E 450 Netbackup 4.5 Fp3 master server connected to a
Quantum
> > P4000 using SDLT220 drives. I have 4 tape devices hooked up to the
system.
> > Iam seeing extremely slow performance while runnig 4 jobs. Iam getting
> > around 2Mb/sec per drive.. also I have tweaked a lot of NB parameters
with
> > out much success.
> >
> >
> >
> > Please help
> >
> >
> >
> > Thanx
> >
> >
> >
> > _______________________________________________
> > Veritas-bu maillist - Veritas-bu AT mailman.eng.auburn DOT edu
> > http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
> >
> >
>
> _______________________________________________
> Veritas-bu maillist - Veritas-bu AT mailman.eng.auburn DOT edu
> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
>
--=_alternative 006B199686256D7C_=
Content-Type: text/html; charset="US-ASCII"
<br><font size=2 face="sans-serif">i had a freaky scsi problem. I managed
to confirm it with scsiinfo from http://www.cs.toronto.edu/~jdd/</font>
<br>
<br><font size=2 face="sans-serif">the channel was only sync'ing up at
5mb/s.</font>
<br>
<br><font size=2 face="sans-serif">I rebooted the box and that seemed to
fix the problem.</font>
<br>
<br><font size=2><tt>veritas-bu-admin AT mailman.eng.auburn DOT edu wrote on
08/08/2003
11:10:35 AM:<br>
<br>
> Hello dennis<br>
> <br>
> Iam using an E450 with 4 processors. also I have been running this
for<br>
> quite a while.This server is my master server and i began to notice<br>
> performance issues only after significant increase in my catalog data.<br>
> I ran a couple of tests<br>
> i did a simple tar tests to all the 4 drives at the same time and<br>
> iam seeing same slow performance with tar also.<br>
> <br>
> Then i did a tar of a huge directory to /dev/null and this completed
with<br>
> 30MB/sec.That means that the O.S. seems to working fine.<br>
> <br>
> Iam unable to find whether the problem is with the scsi subsystem
or with<br>
> the controller card<br>
> <br>
> <br>
> Thanks<br>
> vR<br>
> <br>
> <br>
> On Fri, 8 Aug 2003, Dennis Dwyer wrote:<br>
> <br>
> > A couple of questions first.<br>
> ><br>
> > How many processors in your E450?<br>
> ><br>
> > Did you just implement SDLT220 drives or have you been running
them awhile?<br>
> ><br>
> > If you didn't just implement them, have they been running <br>
> satisfactorily and then all of a sudden started running badly?<br>
> ><br>
> > The reason I ask is I was considering adding SDLT drives to my
<br>
> L700 library last year (there were 8 DLT8000's in there). The vendor<br>
> (STK) was adamant about the fact that for SDLT you need to have one
<br>
> processor per tape drive in order to take full advantage of its <br>
> performance. Perhaps someone can confirm or deny that fact for me
<br>
> but that's was the party line from STK as recently as last October.<br>
> ><br>
> > So ... If you just implemented the drives and you're running
4 <br>
> SDLT drives on a base E450 with two 400Mhz CPU's, that could be a
<br>
> problem for you. Obviously this reasoning might not apply if they
<br>
> had been running well and all of a sudden the performance problem
<br>
> started (unless you had a significant increase in the amount of data<br>
> you're transferring).<br>
> ><br>
> > Regards,<br>
> > Dennis<br>
> ><br>
> > Dennis F. Dwyer<br>
> > Manager, Systems Software<br>
> > Tampa Electric Company<br>
> ><br>
> > (813) 225-5181 - Voice<br>
> > (813) 275-3599 - FAX<br>
> ><br>
> > Visit our corporate website at www.tecoenergy.com<br>
> ><br>
> > The Colonel Says: "Time is not a test of the truth"<br>
> > Translation: Just because you've always done it that way, doesn't
<br>
> make it right<br>
> ><br>
> > >>> Vijaykumar Rajendra Rao <vrajendr AT mipos2.intel DOT
com>
08/07/2003<br>
> 12:52:04 PM >>><br>
> ><br>
> > hello all<br>
> ><br>
> > i have a sun E 450 Netbackup 4.5 Fp3 master server connected
to a Quantum<br>
> > P4000 using SDLT220 drives. I have 4 tape devices hooked up to
the system.<br>
> > Iam seeing extremely slow performance while runnig 4 jobs. Iam
getting<br>
> > around 2Mb/sec per drive.. also I have tweaked a lot of NB parameters
with<br>
> > out much success.<br>
> ><br>
> ><br>
> ><br>
> > Please help<br>
> ><br>
> ><br>
> ><br>
> > Thanx<br>
> ><br>
> ><br>
> ><br>
> > _______________________________________________<br>
> > Veritas-bu maillist - Veritas-bu AT mailman.eng.auburn
DOT edu<br>
> > http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu<br>
> ><br>
> ><br>
> <br>
> _______________________________________________<br>
> Veritas-bu maillist - Veritas-bu AT mailman.eng.auburn DOT
edu<br>
> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu<br>
> <br>
</tt></font>
--=_alternative 006B199686256D7C_=--
|
|
|
