If you need to replace a SAS controller or a SAS expander, you can do so without removing the host from the physical rack.
Ensure that there are at least 4 hosts in the management or workload domain to which the faulty host belongs. If there are less than 4 hosts, add a host to the domain from the capacity pool if possible.
- Place the affected host in maintenance mode.
- Add or update the driver for the new controller.
- Shut down the host.
- Replace the controller.
See SCSI and SATA Storage Controller Conditions, Limitations, and Compatibility in the vSphere product documentation.
- Restart the host.
- Verify that the driver is properly loaded and used by the controller. All disks are seen, all disk groups are healthy.
For example, all disks are visible and all disk groups have a status of Healthy.
- Take the host of maintenance mode.