The datastore refresh operation updates the datastore lists and storage information, such as the datastore capacity, displayed in the vSphere Client. When you perform datastore management tasks or make changes in the SAN configuration, you might need to use storage adapter rescan to scan storage devices and datastores.

Typically, your host or the vCenter Server automatically rescans storage adapters and updates storage devices and VMFS datastores after you make configuration changes. In certain cases, you need to manually rescan storage adapters.

You can rescan all adapters on your host. If the changes you make are isolated to a specific adapter, rescan only this adapter. If your vSphere Client is connected to a vCenter Server system, you can rescan adapters on all hosts managed by the vCenter Server system.

Perform a rescan each time you make one of the following changes.

Zone a new disk array on a SAN.

Create new LUNs on a SAN.

Change the path masking on a host.

Reconnect a cable.

Make a change to a host in a cluster.

Add a single host to the vCenter Server after you have edited or removed from the vCenter Server a datastore shared by the vCenter Server hosts and the single host.


Do not rescan when a path is unavailable. If one path fails, another takes over and your system continues to be fully functional. If, however, you rescan at a time when a path is not available, the host removes the path from its list of paths to the device. The path cannot be used by the host until the next time a rescan is performed while the path is active.