You 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.
When you unplug a capacity device without removing it from the vSAN cluster, the virtual machines on the disk group become inaccessible and the components on the group are marked as absent.
If the capacity device fails, the virtual machines become inaccessible and the components on the group are marked as degraded. See Capacity Device Not Accessible in a vSAN Cluster.
If your vSAN cluster uses deduplication and compression, you must remove the entire disk group from the cluster before you replace the device.
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 capacity device, verify the following requirements:
Verify that the cluster contains enough space to migrate the data from the capacity device.
Place the host in maintenance mode. See Place a Member of vSAN Cluster in Maintenance Mode.
- In the vSphere Web Client, navigate to the vSAN cluster.
- On the Configure tab, click Disk Management under vSAN.
- Select the disk group that contains the device that you want to replace.
- Select the flash capacity device or magnetic disk, 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.