Re: Growing an aggregate with different sized disks.

Thanks Michael;

So, sounds like it can be done, but based on the other responses I received, sounds like it's not really a good idea and can result in odd behavior...

Ray

On Wed, Feb 02, 2011 at 02:36:21PM -0800, Michael Colbert wrote:

You can add the larger disks to the same aggr, but specify that they be placed in a new raid group, like so:

aggr add aggr1 -n -g new 4@450

The "-g new" part is what specifies creating a new raid group, rather than adding to the existing one with smaller disks.

Hope that helps, Michael Colbert

On Wed, Feb 2, 2011 at 2:24 PM, Ray Van Dolson rvandolson@esri.com wrote:

Have an aggregate comprised of 300GB disks and have two new shelves
with 450GB disks.

I ran across this[1] which describes some concerns when dealing with
disks of mixed sizes.

It sounds like I can't specify that 450GB disks and 300GB disks be
assigned to distinct raid groups (my raid size is 16), so if I add the
450GB disks to my aggregate, I'll likely only be able to use 300GB of
them.

Therefore I should create a new aggregate for the 450GB disks.

Is my understanding of this correct?

Also, the raid size seems to default to 16 -- I'm used to keeping
RAID-6 raid groups to 9 disks at most.  Is 16 OK?

Thanks,
Ray

[1] http://now.netapp.com/NOW/knowledge/docs/ontap/rel7261/html/ontap/smg/
provisioning/concept/c_oc_prov_raid-group-add-lrg.html