Under certain conditions, you must replace hardware components, drivers, firmware, and storage I/O controllers in the vSAN cluster. In vSAN, you should replace hardware devices when you encounter failures or if you must upgrade your cluster. Replace a Flash Caching Device on a HostYou should replace a flash caching device if you detect a failure or when you must upgrade it. Before you physically unplug a flash device from the host, you must manually remove the device from vSAN. Replace a Capacity DeviceYou should replace a flash capacity device or a magnetic disk if you detect a failure or when you upgrade it. Before you physically remove the device from the host, you must manually delete the device from vSAN. Remove a Device from a Host by Using an ESXCLI CommandIf you detect a failed storage device or if you upgrade a device, you can manually remove it from a host by using an ESXCLI command. Parent topic: Handling Failures in vSAN