IBM N Series, Hardware Manual

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Chapter 9. MetroCluster expansion cabling
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If there is similar output, disk drives with downrev firmware were detected and the
firmware is updated automatically. Go to the next step.
If there is no similar output, wait for an hourly message on the console and take the
applicable following action:
If there is no message on the console about disk drive firmware, this means that the disk
drive firmware is current and no action is needed.
If there is a message containing disk.fw.downrevWarning and text stating disks have
downrev firmware that you must update, update the disk drive firmware by completing the
following steps:
Actual output might look similar to the following example:
Sun May 5 04:00:01 PDT [svt-6040-01: disk.fw.downrevWarning:warning]: 1 disks
have downrev firmware that you need to update.
a. Download the disk drive firmware from the IBM N series support site.
b. Enter the following command at the storage system console to update the disk drive
firmware:
disk_fw_update
You must run this command on both controllers.
2. Complete the following steps to verify that the disk shelf firmware is the most current
version:
a. Enter the following command at the storage system console:
sasadmin expander_map
b. Locate the disk shelf firmware information for the hot-added disk shelf in the output.
Example: 0151 is the disk shelf firmware version for shelf number one (Slot A/IOM A) in
the storage system, as shown in the following example:
Expanders on channel 4a:
Level 3: WWN 500a0980000840ff, ID 1, Serial Number ' SHU0954292G114C',
Product 'DS424IOM6', Rev '0151', Slot A
c. Compare the firmware information in the command output with the disk shelf firmware
information at the IBM N series support site to determine the most current disk shelf
firmware version.
3. The next step depends on how current the disk shelf firmware is:
– If the firmware version in the command output is the same as or later than the most
current version on the N series support site, no disk shelf firmware update is needed.
– If the firmware version in the command output is an earlier version than the most
current version on the N series support site, download and install the new disk shelf
firmware file. You can run the commands from either node.
9.2.5 Replacing FibreBridge and SAS copper cables with SAS optical cables
You must halt both controllers of the stretch MetroCluster to replace all FibreBridge 6500N
bridges, shelf-to-shelf SAS copper cables, and bridge-to-shelf SAS copper cables with SAS
optical cables.
Attention: Running this command delays I/O on the disk drives on which you are
updating the firmware.