You can determine the model and firmware version you are running by connecting to the CMC via the web interface and selecting the Chassis Overview.
First thing you’ll need to do is obtain the firmware from www.dell.com. At the time of this writing, current firmware version is 4.40.
Once download has completed go back to the CMC web interface, click on the Chassis Overview menu option on the left hand side, then on the Update tab (top right).
You’ll see the two CMC modules and their current firmware versions.
We’ll start by upgrading the firmware on the standby CMC. Check the box next to the cmc-standby component labeled Update Targets, then click on the Apply CMC Update button. Next, click on the Browse… button to locate the firmware image you have downloaded previously, then click on the Begin Firmware Update button.
The image file will first be transferred to the unit, then the image will be updated.
In my case, the transfer of the file took approximately 1:20 min and another 4:20 min for the image to be upgraded. Once completed click on the Component Inventory button.
Note that the standby unit’s firmware has been upgrade. At this point you may receive an error message stating that there is software incompatibility because you are running your two CMCs with two different firmware revisions.
Next we’ll need to go to Chassis Overview, then click on the Troubleshooting tab, and select Reset Components option. Here we’ll need to click on the Reset/Failover CMC to make the CMC we just updated the active one.
Confirm that you want to failover CMC.
You may need to refresh the web page and reauthenticate to connect to the now active CMC. Notice that cmc-active is now the one with the older version of the firmware.
Repeat the steps outlined above to upgrade the firmware on this CMC. This will complete the firmware upgrade.
Note that the firmware upgrade is not service impacting in a sense that the blade servers (TCP/IP) stay available to users. The only thing that will be affected is iDRAC/OOB management.