On 6/3/10 12:06 AM -0400 Roman Naumenko wrote:
I think there is a difference. Just quickly checked netapp site:
Adding new disks to a RAID group If a volume has more than one RAID
group, you can specify the RAID group to which you are adding disks.
hmm that's a surprising feature to me.
I remember, and this was a few years back but I don't see why it would
be any different now, we were trying to add drives 1-2 at a time to
medium-sized arrays (don't buy the disks until we need them, to hold
onto cash), and the Netapp performance kept going down down down. We
eventually had to borrow an array from Netapp to copy our data onto
to rebalance. Netapp told us explicitly, make sure to add an entire
shelf at a time (and a new raid group, obviously, don't extend any
existing group).
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