I no longer use a fragment size...it is set to 0.  This was recommended
by veritas since all new tape drives can position to location within a
fragment (can't remember what that is called...).  The fragment size is
a throw back to when tape drives could only position to a file marker.
I had to remove my fragment size to properly duplicate my NDMP backups,
otherwise if I dup'd with the 2048 meg fragment, then the NAS machine
wouldn't be able to read the dup'd copy.

Scott Chapman
Senior Technical Specialist
Storage and Database Administration
ICBC - Victoria
Ph:  250.414.7650  Cell:  250.213.9295
 


-----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 Jim
Horalek
Sent: Monday, March 03, 2008 2:44 PM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Fragment Size





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
>>
>>
>>
>>
>>
>>
> _______________________________________________
> Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
>
_______________________________________________
Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu

_______________________________________________
Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu

_______________________________________________
Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu