Justin
Ok, well by default in Windows, the Max Fragment size appears to be set for
"1048576".

Anyone else in a Windows environemnt who can confirm what your storage
setting is set for please?

Regards

Simon Weaver
3rd Line Technical Support
Windows Domain Administrator 

EADS Astrium Limited, B32AA IM (DCS)
Anchorage Road, Portsmouth, PO3 5PU

Email: Simon.Weaver at Astrium-eads.net



-----Original Message-----
From: Justin Piszcz [mailto:jpiszcz at lucidpixels.com] 
Sent: 21 June 2006 09:10
To: WEAVER, Simon
Cc: veritas-bu at mailman.eng.auburn.edu
Subject: Re: [Veritas-bu] Fragment size question,something that affects us
all..


2048MB is what most people set, but the fragment-to-filesize is the best 
way to optimize this for your restores.

On Wed, 21 Jun 2006, WEAVER, Simon wrote:

>
> Hello Justin
> Sorry I have been unwell.
> Ok, well not sure really, but are you referring to the fragmentation 
> size on the storage unit that you can change? If I recall, I think 1TB 
> is the max size you can set, but I thought this affected just restores 
> Justin.
>
> Unless I am missing the point here??
>
> Regards
>
> Simon Weaver
> 3rd Line Technical Support
> Windows Domain Administrator
>
> EADS Astrium Limited, B32AA IM (DCS)
> Anchorage Road, Portsmouth, PO3 5PU
>
> Email: Simon.Weaver at Astrium-eads.net
>
>
>
> -----Original Message-----
> From: Justin Piszcz [mailto:jpiszcz at lucidpixels.com]
> Sent: 20 June 2006 16:50
> To: veritas-bu at mailman.eng.auburn.edu
> Subject: Re: [Veritas-bu] Fragment size question,something that 
> affects us all..
>
>
> Any comments on this? Simon? :)
>
> On Tue, 20 Jun 2006, Justin Piszcz wrote:
>
>> Finding the sweet spot for the fragment size is a time consuming task 
>> as each of our environments is different.
>>
>> How much does each 'index' per each fragment take up?
>>
>> Say I backup 200GB to an LTO2 tape, if I write an index every 2GB, 
>> how much space is lost due to the file markers?
>>
>> I know the file markers immensely speed up the restores, but what is 
>> the impact of them on backups?  Has anyone thought of this?
>>
>> Also, what if the fragment size is 32GB and the backup is exactly 
>> 32GB? Are two fragments written or one?
>>
>> If any of you have thought about this, please comment!
>>
>> Thanks,
>>
>> Justin.
>>
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EADS Astrium Limited, Registered in England and Wales No. 2449259
Registered Office: Gunnels Wood Road, Stevenage, Hertfordshire, SG1 2AS, England