You 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 Virtual SAN.
When you replace a flash caching device, the virtual machines on the disk group become inaccessible and the components on the group are marked as degraded. See A Flash Caching Device Is Not Accessible in a Virtual SAN Cluster.
Verify that the storage controllers on the hosts are configured in passthrough mode and support the hot-plug feature.
If the storage controllers are configured in RAID 0 mode, see the vendor documentation for information about adding and removing devices.
- If you upgrade the flash caching device, verify the following requirements:
- If you upgrade the flash caching device, verify that the cluster contains enough space to migrate the data from the disk group that is associated with the flash device.
- Place the host in maintenance mode. See Place a Member of Virtual SAN Cluster in Maintenance Mode.
- In the vSphere Web Client, navigate to the Virtual SAN cluster.
- On the Configure tab, click Disk Management under Virtual SAN.
- Select the disk group that contains the device that you want to replace.
- Select the flash caching device and click Remove selected disk(s) from disk group.
What to do next
- Add a new device to the host.
The host automatically detects the device.
- If the host is unable to detect the device, perform a device rescan.