vSphere Storage - ESXi 5.1 - Documentation - VMware

Storage Refresh and Rescan Operations
The refresh operation for datastores, storage devices, and storage adapters updates the lists and storage
information displayed in the vSphere Client or the vSphere Web Client. For example, it updates such
information as the datastore capacity. When you perform storage management tasks or make changes in the
SAN configuration, you might need to rescan your storage.
When you perform VMFS datastore management operations, such as creating a VMFS datastore or RDM,
adding an extent, and increasing or deleting a VMFS datastore, your host or the vCenter Server automatically
rescans and updates your storage. You can disable the automatic rescan feature by turning off the Host Rescan
Filter. See “Turn off Storage Filters,” on page 173.
In certain cases, you need to perform a manual rescan. You can rescan all storage available to your host, or, if
you are using the vCenter Server, to all hosts in a folder, cluster, and datacenter.
If the changes you make are isolated to storage connected through a specific adapter, perform a rescan for this
adapter.
Perform the manual rescan each time you make one of the following changes.
n Zone a new disk array on a SAN.
n Create new LUNs on a SAN.
n Change the path masking on a host.
n Reconnect a cable.
n Change CHAP settings (iSCSI only).
n Add or remove discovery or static addresses (iSCSI only).
n 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.
IMPORTANT If you rescan when a path is unavailable, the host removes the path from the list of paths to the
device. The path reappears on the list as soon as it becomes available and starts working again.
Perform Storage Rescan in the vSphere Client
When you make changes in your SAN configuration, you might need to rescan your storage. You can rescan
all storage available to your host. If the changes you make are isolated to storage accessed through a specific
adapter, perform rescan for only this adapter.
Use this procedure if you want to limit the rescan to storage available to a particular host or accessed through
a particular adapter on the host. If you want to rescan storage available to all hosts managed by your vCenter
Server system, you can do so by right-clicking a datacenter, cluster, or folder that contains the hosts and
selecting Rescan for Datastores.
Procedure
1 In the vSphere Client, select a host and click the Configuration tab.
Chapter 15 Managing Storage Devices
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