Creating and Configuring Storage Devices - Mastering VMware vSphere 5.5 - page 328

3. Click the Rescan All icon.

4. If you want to scan only for new LUNs that have been zoned or presented to the ESXi
host, select Scan For New Storage Devices and deselect Scan For New VMFS Volumes.

5. If you want to scan only for new VMFS datastores, deselect Scan For New Storage Devices
and select Scan For New VMFS Volumes.

6. If you want to do both, simply click OK (both are selected by default). You'll see the
appropriate tasks appear in the Tasks pane of the vSphere Web Client.

You'll note that two tasks appear in the Recent Tasks pane of the vSphere Web Client: a
task for rescanning all the HBAs and a task for rescanning VMFS.

The task for rescanning the HBAs is pretty straightforward; this is a query to the host
HBAs to see if new storage is available. If new storage is available to an adapter, it will
appear in the details pane of the Storage Adapters area in the vSphere Web Client.

The second task is a bit different. The VMFS rescan is triggered automatically, and it
scans available storage devices for an existing VMFS datastore. If it i nds an existing
VMFS datastore, it will attempt to mount the VMFS datastore and make it available to the
ESXi host. Automatically triggering the VMFS rescan simplii es the process of making
new VMFS datastores available to ESXi hosts.

In addition to rescanning just all HBAs or CNAs, you can rescan a single storage adapter.
Perform the following steps to rescan a single storage adapter:

1. In the vSphere Web Client, navigate to the Manage tab for a specii c ESXi host in the
Hosts And Clusters view.

2. From the Storage subsection, select Storage Adapters on the left.

3. Select one of the adapters in the list and then click the Rescan icon above the list (fourth
from the left).

You Can Also Rescan an Entire Cluster

If you right-click a cluster object in the Hosts And Clusters view, you can also rescan an entire
cluster for new storage objects by clicking All vCenter Actions

➢

Rescan Storage.

Assuming that the zoning of your Fibre Channel SAN is correct and that the storage has been
presented to the ESXi host properly, your new LUN should appear in the details pane.
Once the LUN is visible, you're ready to create a new VMFS datastore on it, but before we get
to that, we need to cover the processes for adding a LUN via FCoE and via iSCSI.