After adding new disks to a controller you might come across an error about Max Raid Size Group

Default Raidsize group depends on size of disk but this will be 16 , FYI – The maximum RAID group size is 28

There does not seem to be an easy way to do this via GUI

Open Cluster Shell , enter the following to get into Aggr Options

Source code

aggr

Show your existing maxraidsize

Source code

aggr show -fields maxraidsize

Change the Value

Source code

aggr modify -aggregate aggrname -maxraidsize 18