Hi Wayne,
I tried to change the fragment to 10 G but nothing it's changed... I use the
same fragment on another installation with the IBM TS1120 drive and we reach
120 MB/s backupping Oracle BCV's....
SIZE_DATA_BUFFERS 262144
I tried to use a disk storage unit on the same MM but the speed it's the
same... i'm going mad...
What I don't tried it's to use NTbackup..
>From: Wayne T Smith <wts at maine.edu>
>To: marco chiapusso <mchiapusso at hotmail.com>
>Subject: Re: [Veritas-bu] LTO 3 - Windows 2003 SP1 - NBU 5.x poor
>performance
>Date: Wed, 03 Jan 2007 17:37:33 -0500
>
>Hi Marco,
>
>Well, at 7mb/s you're shoe-shining, so "waiting for full buffer" is really
>weird.
>
>The fragment size of 4M is *really* small ... maybe start at 2G?
>
>Is your SIZE_DATA_BUFFERS really "256k", or a 6-digit number of about the
>same size? NetBackup likes the latter ... I don't know about the former.
>
>Can you write to a tape outside of NetBackup any better (with local data)?
>
>Can you get data to your MM machines faster (such as to disk)?
>
>... just some dumb ideas ...
>
>Please let us know what you find!
>
>cheers, wayne
>
>marco chiapusso wrote, in part, on 1/3/2007 4:59 PM:
>>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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