Veritas-bu

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

2007-01-03 17:28:07
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 23:28:07 +0100
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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