The refresh operation for datastores, storage devices, and storage adapters updates the lists and storage information that the VMware Host Client displays. It updates information such as the datastore capacity.
When you perform storage management tasks or make changes in the SAN configuration, you might need to rescan your storage.
Perform Adapter Rescan in the VMware Host Client
When you make changes in your SAN configuration and these changes are isolated to storage accessed through a specific adapter, perform rescan for only this adapter. When you rescan an adapter, you discover any new LUNs that are available on that adapter.
Procedure
- Click Storage in the VMware Host Client inventory and click Adapters.
- Click Rescan.
Perform Device Rescan in the VMware Host Client
When you rescan a device, you discover any new VMFS volumes that are available on the device.
Procedure
- Click Storage in the VMware Host Client inventory and click Devices.
- Click Rescan.
Change the Number of Scanned Storage Devices in the VMware Host Client
The range of scanned LUN IDs for an ESXi host can be from 0 to 16,383. ESXi ignores LUN IDs greater than 16,383. The configurable Disk.MaxLUN parameter controls the range of scanned LUN ID range. The parameter has a default value of 1024.
You can modify the Disk.MaxLUN parameter depending on your needs. For example, if your environment has a smaller number of storage devices with LUN IDs from 1 through 100, set the value to 101. As a result, you can improve device discovery speed on targets that do not support REPORT_LUNS. Lowering the value can shorten the rescan time and boot time. However, the time to rescan storage devices might also depend on other factors, including the type of the storage system and the load on the storage system.
In other cases, you might need to increase the value if your environment uses LUN IDs that are greater than 1023.
