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We currently use 64kb block size for dedupe on all our storage policies except for VMware where we use 32kb.

We do this because at the time we setup the policies it was the recommendation from Commvault.

I'm in the process of building up a new MA and the current recommendation according to the Building Blocks white paper is to use 128kb block size.

What are the pros and cons of this please?

I'm already wavering over whether to migrate the existing data to the new MA via aux copy or just start from scratch, and if the suggestion is to change the block size used for dedupe that also throws a question up as to the best time to change the block size.

Our clients are all FS iDA's with the exception of Exchange and VMware.

Thanks,
Paul
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128kb offers higher throughput with only a small reduction in the amount of saving compared between 64kb and 128kb
As a FYI, in v9 the default block size when creating a storage policy with de-duplication is already set to 128KB.


Kind Regards,
Luke Walker



On 10 February 2012 07:40, Paul Hutchings <paul.hutchings < at > mira.co.uk ([email]paul.hutchings < at > mira.co.uk[/email])> wrote:
 
We currently use 64kb block size for dedupe on all our storage policies except for VMware where we use 32kb.

We do this because at the time we setup the policies it was the recommendation from Commvault.

I'm in the process of building up a new MA and the current recommendation according to the Building Blocks white paper is to use 128kb block size.

What are the pros and cons of this please?

I'm already wavering over whether to migrate the existing data to the new MA via aux copy or just start from scratch, and if the suggestion is to change the block size used for dedupe that also throws a question up as to the best time to change the block size.

Our clients are all FS iDA's with the exception of Exchange and VMware.

Thanks,
Paul
--
MIRA Ltd

Watling Street, Nuneaton, Warwickshire, CV10 0TU, England
Registered in England and Wales No. 402570
VAT Registration GB 100 1464 84

The contents of this e-mail are confidential and are solely for the use of the intended recipient. If you receive this e-mail in error, please delete it and notify us either by e-mail, telephone or fax. You should not copy, forward or otherwise disclose the content of the e-mail as this is prohibited.









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