Veritas-bu

[Veritas-bu] RE: perfomance problem using Sun E450 with SDLT drives

2003-08-08 12:10:35
Subject: [Veritas-bu] RE: perfomance problem using Sun E450 with SDLT drives
From: vrajendr AT mipos2.intel DOT com (Vijaykumar Rajendra Rao)
Date: Fri, 8 Aug 2003 09:10:35 -0700 (PDT)
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
>
>


<Prev in Thread] Current Thread [Next in Thread>