IBM N series Hardware Manual page 160

b. Enter the following command to verify that all disk drives can be seen by the system:
sasadmin shelf adapter_name
The system displays a representation of your disk shelf that is populated with all the
disk drives it sees.
c. Enter the following command to verify that all IOMs (expanders) can be seen by the
system (SAS channels and controller ports):
sasadmin expander_map adapter_name
The following example of output from this command shows that a single expander, IOM
B (slot B), in shelf 3 (ID 3) is attached to port 4a (channel 4a) on the controller:
Expanders on channel 4a:
Level 1: WWN 500a098000049c3f, ID 3, Serial Number 1006SZ00196, Product
'DS224IOM6 ', Rev '0134', Slot B
3. Check whether your system has disk autoassignment enabled by entering the following
command at the console of either node:
options disk.auto_assign
If disk autoassignment is enabled, the output shows disk.auto_assign on.
4. If your system does not have disk autoassignment enabled or disk drives in the same
stack are owned by both nodes, assign disk drives to the appropriate pools by using the
"Assigning disk pools in a stretch MetroCluster configuration" procedure that is described
in the Data ONTAP High Availability and MetroCluster Configuration Guide for 7-Mode.
Be sure to also complete the "Verifying disk paths" procedure to which you are directed.
5. If you hot-added a disk shelf with SAS optical cables to a stack of disk shelves that are
connected with SAS copper cables, replace the SAS copper cables for the rest of the
shelf-to-shelf connections and the controller-to-shelf connections so that the stack meets
the cabling rules.
6. Go to the next section, "Verifying the disk drive and disk shelf firmware versions" on
page 140.
Verifying the disk drive and disk shelf firmware versions
Because Data ONTAP does not always automatically update the disk drive and disk shelf
firmware on hot-added SAS disk shelves, you must verify that the disk drive and disk shelf
firmware are the most current versions. If they are not the most current versions, you must
manually update the firmware.
Complete the following steps:
1. Check the console for a message that contains dbfu.selected:info and text stating
selected for background disk firmware update to determine whether you must manually
update the disk drive firmware.
For example, actual output might look similar to the following example:
Fri Jul 19 13:05:23 PDT [svt-8040-02:bdfu.selected:info]: Disk
svt-16g-sw4:4.126L64 [NETAPP X420_SFIRF300A10 NQ03] S/N [3SE0W95500009017R4SV]
selected for background disk firmware.
After disk drives are assigned on the hot-added disk shelf, the disk drive firmware updates
should automatically begin on each disk drive with downrev firmware. A repeated
message similar to what is shown in the previous example appears on the console every
3 - 5 minutes (the time it takes to update downrev firmware on a disk drive), which shows
the firmware update progress.
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IBM System Storage N series Hardware Guide