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Storage : Disks : Understanding disks : What happens when you add storage to an aggregate
What happens when you add storage to an aggregate
By default, Data ONTAP adds new disks or array LUNs to the most recently created RAID group until it reaches its maximum size. Then Data ONTAP creates a new RAID group. Alternatively, you can specify a RAID group you want to add storage to.
When you create an aggregate or add storage to an aggregate, Data ONTAP creates new RAID groups as each RAID group is filled with its maximum number of disks or array LUNs. The last RAID group formed might contain fewer disks or array LUNs than the maximum RAID group size for the aggregate. In that case, any storage added to the aggregate is added to the last RAID group until the specified RAID group size is reached.
If you increase the RAID group size for an aggregate, new disks or array LUNs are added only to the most recently created RAID group; the previously created RAID groups remain at their current size unless you explicitly add storage to them.
Note: You are advised to keep your RAID groups homogeneous when possible. If needed, you can replace a mismatched disk with a more suitable disk later.

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