[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
>
>
>
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