Veritas-bu

[Veritas-bu] LTO 3 - Windows 2003 SP1 - NBU 5.x poor performance

2007-01-03 17:52:46
Subject: [Veritas-bu] LTO 3 - Windows 2003 SP1 - NBU 5.x poor performance
From: mchiapusso at hotmail.com (marco chiapusso)
Date: Wed, 03 Jan 2007 23:52:46 +0100
My SAN.. ok
I have 4 switch, 2 Fabric.
The fabric have a 8 MB  trunk (4x2 GB)
The IBM 3584 tape library it's connected there...

>From: Dominik.J.Pietrzykowski at nab.com.au
>To: "marco chiapusso" <mchiapusso at hotmail.com>
>CC: austin.murphy at gmail.com
>Subject: Re: [Veritas-bu] LTO 3 - Windows 2003 SP1 - NBU 5.x poor 
>performance
>Date: Thu, 4 Jan 2007 09:45:33 +1100
>
>
>Marco,
>
>I'd look at the way your SAN is setup, maybe the buffers are setup more
>for writes
>than reads. This could be why you are getting bad performance between the
>SAN
>and media server. I'm assuming you have the SAN fibre attached with decent
>
>bandwidth ?
>
>Regards,
>
>Dominik
>
>
>
>
>
>
>"marco chiapusso" <mchiapusso at hotmail.com>
>Sent by: veritas-bu-bounces at mailman.eng.auburn.edu
>04/01/2007 09:28 AM
>
>To
>austin.murphy at gmail.com
>cc
>veritas-bu at mailman.eng.auburn.edu
>Subject
>Re: [Veritas-bu] LTO 3 - Windows 2003 SP1 - NBU 5.x poor performance
>
>
>
>
>
>
>Austin,
>I'm using 1 drives, and I want to use just one for each job...
>
>
> >From: "Austin Murphy" <austin.murphy at gmail.com>
> >To: "marco chiapusso" <mchiapusso at hotmail.com>
> >CC: veritas-bu at mailman.eng.auburn.edu
> >Subject: Re: [Veritas-bu] LTO 3 - Windows 2003 SP1 - NBU 5.x poor
> >performance
> >Date: Wed, 3 Jan 2007 17:24:00 -0500
> >
> >How many "Maximum concurrent drives used for backups" is your storage
> >unit configured to write to?
> >
> >Start small and work your way up.
> >Set your STU to 1 drive and MPX=4. Measure performance.
> >increase MPX to 8. measure...
> >Set the STU to 2 drives. measure...
> >
> >"Waiting for full buffer" means you are starving your tape drives.
> >
> >Austin
> >
> >On 1/3/07, marco chiapusso <mchiapusso at hotmail.com> wrote:
> >>Hi Guys, still in trouble with LTO3 performance...
> >>I've change everything but it doesn't work!!! oufff
> >>I installed a lot of NBU domain but this time I hate them all!!!
> >>
> >>The enviroment it's all Windows 2003 sp1 , 1 master and 4 SAN Media
> >>Manager
> >>(clustered)
> >>The tape library it's an IBM 3584 with 4 IBM LTO3, SAN connected
> >>
> >>The maximum performance it's about ehm ehm 7 MB/sec ... kill me plz!!!
> >>
> >>I have tried all the combination
> >>SIZE_DATA_BUFFERS 256k
> >>NUMBER_DATA_BUFFERS 32 - 48 - 64 -128 -256
> >>
> >>MPX 4 - 8
> >>FRAGMENT SIZE 4 MB & 10GB
> >>
> >>The funny things it's that I have some optimization of my perfromance
>from
> >>5
> >>MB/sec to 7 using NUMBER at 64, incrising them upper to 256  no
>CHANGES!!!
> >>
> >>I look to BPTM logs (verbose 5) I find a lot of waited for full
>buffer...
> >>
> >>Now I'm reading something about tape.sys and Maximumsg... changed
>Maximum
> >>to
> >>FF nothing!!!
> >>
> >>I'm using IBM tape drivers on windows... all the media server have the
> >>same
> >>performance issue..
> >>
> >>Any IDEA plz!!!!! Dont' say open a case to support ..!!! LOL
> >>
> >>Txs again guys!!!
> >>
> >>_________________________________________________________________
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