Hot-removing disk shelves with IOM12 modules
You can hot-remove a disk shelf with IOM12 modules—nondisruptively remove a disk shelf from a
system that is powered on and serving data (I/O is in progress)—when you need to move or replace
the disk shelf. You can hot-remove one or more disk shelves from anywhere within a stack of disk
shelves or remove a stack of disk shelves.
Before you begin
•
Your system must be a multipath HA, multipath, quad-path HA, or quad-path configuration.
For FAS2600 series, the external storage must be cabled as multipath HA or multipath.
Note:
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.
•
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.
Attention:
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.
•
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 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 a disk can be found in the
Disks and Aggregates
Power Guide.
Note:
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.
ONTAP 9 Disks and Aggregates Power Guide
•
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
•
If you are hot-removing a disk shelf from a stack (but keeping the stack), you recable and verify
one path at a time (path A then path B) to bypass the disk shelf you are removing so that you
always maintain single-path connectivity from the controllers to the stack.
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Summary of Contents for DS224C
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