8.1 RC1 docs say that compression is only available for flexvols within 64 bit aggregates.
Storage Management Guide pdf, page 242




From: Jan-Pieter Cornet <johnpc@xs4all.nl>
To: Jeff Cleverley <jeff.cleverley@avagotech.com>
Cc: "toasters@teaparty.net" <toasters@teaparty.net>
Sent: Wed, October 19, 2011 3:16:13 PM
Subject: Re: 8.1 64 bit upgrades.

On 2011 Oct 19, at 20:36 , Jeff Cleverley wrote:
> Thanks for the reply.  Does anyone know if NetApp plans to change the
> process anytime in the future?  An "aggr modify 64bit-upgrade" would
> be really nice :-)

What exactly does a 64 bit aggr buy you if it also fits in a 32 bits aggr (as it obviously currently does)? (Besides wasting more space for metadata).

I think the whole point of 64 bit aggrs is to be able to be able to expand beyond 16T/aggr. If your current aggr is smaller than that... what's the benefit of going to 64 bit?

>> I've starting playing around with the 8.1 RC1 release.  I want to
>> upgrade some aggregates from 32 bit to 64 bit.  From what I can tell,
>> the only way to do this is to add additional disks to an existing
>> aggregate.  Is that correct?
>>
>> I've got one filer with limited disks and don't want to add 1
>> additional disk to a raid group.  I don't want to do all the
>> associated reallocates to smooth out the data allocation.

--
Jan-Pieter Cornet
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