6.0

2 Select a rescan option.
Option Description
Storage
In the Hardware panel, click Storage, and click Rescan All above the
Datastores or Devices panel.
Storage Adapters
In the Hardware panel, click Storage Adapters, and click Rescan All above
the Storage Adapters panel.
NOTE You can also right-click an individual adapter and select Rescan to
rescan just that adapter.
3 Specify extent of rescan.
Option Description
Scan for New Storage Devices
Rescan all adapters to discover new storage devices. If new devices are
discovered, they appear in the device list.
Scan for New VMFS Volumes
Rescan all storage devices to discover new datastores that have been
added since the last scan. Any new datastores appear in the datastore list.
Change the Number of Scanned Storage Devices
While an ESXi host is limited to accessing 256 SCSI storage devices, the range of LUN IDs can be from 0 to
1023. ESXi ignores LUN IDs 1024 or greater. This limit is controlled by Disk.MaxLUN, which has a default
value of 1024.
The value of Disk.MaxLUN also determines how many LUNs the SCSI scan code attempts to discover using
individual INQUIRY commands if the SCSI target does not support direct discovery using REPORT_LUNS.
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 0 through 100, you can set the value to 101 to
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 depend on other
factors, including the type of 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.
Procedure
1 In the vSphere Client inventory panel, select the host, click the Configuration tab, and click Advanced
Settings under Software.
2 Select Disk.
3 Scroll down to Disk.MaxLUN.
4 Change the existing value to the value of your choice, and click OK.
The value you enter specifies the LUN ID after the last one you want to discover.
For example, to discover LUN IDs from 0 through 100, set Disk.MaxLUN to 101.
Working with Datastores
Datastores are logical containers, analogous to file systems, that hide specifics of each storage device and
provide a uniform model for storing virtual machine files. Datastores can also be used for storing ISO
images, virtual machine templates, and floppy images.
You use the vSphere Client to access different types of storage devices that your ESXi host discovers and to
deploy datastores on them.
vSphere Administration with the vSphere Client
322 VMware, Inc.