The Default Fragment size was orginally 2048 Megabytes.
This was raised to  524,288 megabytes in 5.x or 6.x?? At least for disk. If
I remember right, it was raised to reduce disk fragmentation with Disk
Units.

jim


-----Original Message-----
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Justin
Piszcz
Sent: Monday, March 03, 2008 1:53 PM
To: Martin, Jonathan
Cc: veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Fragment Size


Must be less than 50 GiB for NTFS?  Hm..  I came into an environment that 
had no fragment size set and it (worked) albeit-- it took 2+ hours to 
restore a single file at the end of the tape (using Linux/ext3) however.

Justin.

On Mon, 3 Mar 2008, Martin, Jonathan wrote:

> If you are using NTFS then you size must be less than about 50GB.
> NTFS files larger than that would error in Netbackup on my original 
> testing. I'm currently using 10GB for my fragment sizes but I haven't 
> done any performance testing related to other fragment sizes.
>
> -Jonathan
>
> -----Original Message-----
> From: veritas-bu-bounces AT mailman.eng.auburn DOT edu
> [mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Justin
> Piszcz
> Sent: Monday, March 03, 2008 4:25 PM
> To: Mohre, Oliver
> Cc: veritas-bu AT mailman.eng.auburn DOT edu
> Subject: Re: [Veritas-bu] Fragment Size
>
>
>
> On Mon, 3 Mar 2008, Mohre, Oliver wrote:
>
>> Dear NetBackup community,
>>
>>
>>
>> i have a question about the "Fragment Size" option in NetBackup 6.5
>> Windows Server 2003 environment.
>>
>> Are there any good known values for? Actually I set for all storage
>> units (diskstaging and mediamanagers) a value of 2048 MB - is this a 
>> good option or is this fragment size to small?
> It depends on your dataset, I use 32 GiB personally, back in the day I
> used to use 2048 MiB but with drive backup speeds > 100 MiB/s the 
> drive barely spins up for a few seconds before it has to take a moment 
> and write a marker every 2 gigabytes, I recommend a higher value.
>
> Obviously the higher the value means the longer it will take to seek
> for an individual file so its up to you to pick a good value.
>
>>
>>
>>
>> I would be pleased about some experienced data from same environments
>> (Windows NTFS Filesystem).
>>
>>
>>
>> thanks in advance and greetings,
>>
>> Oliver Mohre
>>
>>
>>
>>
>>
>>
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