Upgrading MLNX-OS Software on Modular Switches

Modular switches feature dual management modules.

Identify the chassis HA master. Run:
```
show chassis ha
```
Upgrade the chassis master according to steps 1-8 in “Upgrading Operating System Software”. Please DO NOT reboot!
Upgrade the second management module according to steps 1-8 in “Upgrading Operating System Software”. Please DO NOT reboot!
Reset the slave management module. In the master management module, run:
```
chassis ha reset other
```
After invoking the command above, please reboot the master management immediately. Run:
```
reload force immediate
```
An alternative for steps 4 and 5 is to power cycle the system.
Check that “reset count” equals 0 or 1. Run:
```
show chassis ha
```
If the reset count is not equal to either 0 or 1, power cycle the system.
Verify all the systems are back online as members of the IB subnet ID. Run:
```
show ib smnodes {brief}
```
Using a modular switch with different software versions on its two management boards is not supported.

When replacing a management board the software running on the replacement board must be aligned with the version of the software running on the other management board.

Last updated: July 07, 2021