Re: what superblock to use

[Luca Berra <bluca@comedia.it>]

On Mon, Apr 20, 2009 at 02:39:05PM -0500, Leslie Rhorer wrote:
>
>> >what's the current recommended superblock to use for a newly created
>> >raid5-6 array with 6 pieces of 1tb disk? by default mdamd use 0.90. is
>> >it worth to change it to any 1.x format?
>> 0.9 has some limitations that 1.x do not have, none apply in your case
>> max_components = 28
>> max_size of component=2TB
>
>Oops!  I did not realize this when I built my array.  I'm going to need to
>grow the array to 3T components after the 3T drives are released.  Can the
>superblock be changed on an existing array, or does it have to be rebuilt
>from scratch?  If the latter, I'm glad I learned this now, because I may
>have to rebuild the array, anyway, to try to alleviate the halt issue I am
>experiencing.

afaik it cannot be changed after creation
if you have free space you could play tricks reducing the fs, recreating
the array with the exact same parameters except metadata and
--assume-clean (you are limited to using 1.0 in this case)
anyway do a backup before trying this.

L.

-- 
Luca Berra -- bluca@comedia.it
         Communication Media & Services S.r.l.
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