• Your system must be a multipath HA, multipath, quad-path HA, or quad-path configuration.
For AFF A200, AFF A220, FAS2600 series and FAS2700 systems, the external storage must be cabled as
multipath HA or multipath.
For a FAS2600 series single-controller system that has the external storage cabled with
multipath connectivity, the system is a mixed-path configuration because the internal storage
uses single-path connectivity.
• Your system cannot have any SAS cabling error messages.
You can download and run Active IQ Config Advisor to view any SAS cabling error messages and the
corrective actions you should take.
NetApp Downloads: Config Advisor
• HA pair configurations cannot be in a takeover state.
• You must have removed all aggregates from the disk drives—the disk drives must be spares-- in the disk
shelves you are removing.
If you attempt this procedure with aggregates on the disk shelf you are removing, you could
fail the system with a multidisk panic.
You can use the
storage aggregate offline -aggregate aggregate_name command and then
the
storage aggregate delete -aggregate aggregate_name command.
• If you are removing one or more disk shelves from within a stack, you must have factored the distance to
bypass the disk shelves you are removing; therefore, if the current cables are not long enough, you need to
have longer cables available.
About this task
• Best practice: The best practice is to remove disk drive ownership after you remove the aggregates from
the disk drives in the disk shelves you are removing.
Removing ownership information from a spare disk drive allows the disk drive to be properly integrated into
another node (as needed).
The procedure for removing ownership from disk drives requires you to disable disk ownership
automatic assignment. You reenable disk ownership automatic assignment at the end of this
procedure.
Disks and aggregates overview
• For a clustered ONTAP system that is greater than two-nodes, best practice is to have reassigned epsilon
to an HA pair other than the one that is undergoing planned maintenance.
Reassigning epsilon minimizes the risk of unforeseen errors impacting all nodes in a clustered ONTAP
system. Information about the role of quorum and epsilon, and the procedure for reassigning epsilon to
another node in a cluster can be found in the System Administration Reference.
Find a System Administration Guide for your version of ONTAP 9
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