You must replace a flash caching device if you detect a failure or when there is a disk group upgrade. Removing the cache device removes the entire disk group from the vSAN cluster.
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 vSAN Cluster.
Prerequisites
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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.
Procedure
Results
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.
For more information on creating a disk group, claiming storage devices, or adding devices to the disk group in the vSAN Cluster, see Device Management in a vSAN Cluster.