A new LUN has been created on an iSCSI array and assigned to an ESXi 5.x server. However, when the administrator logs in to the vSphere Web Client the LUN is not visible. Other LUNs on the iSCSI array are visible.
What should the administrator do to resolve this issue?
A. Rescan for the new storage device
B. Ensure the LUN is zoned correctly
C. Add the new LUN to the Static Discovery list
D. Ensure the CHAP settings are correctly configured
Correct Answer: A
Explanation/Reference:
Explanation:
We need to perform a manual rescan after adding a storage LUN.
The refresh operation for datastores, storage devices, and storage adapters updates the lists and storage information displayed in 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.
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.
Zone a new disk array on a SAN.
Create new LUNs on a SAN.
Change the path masking on a host.
Reconnect a cable.
Change CHAP settings (iSCSI only).
Add or remove discovery or static addresses (iSCSI only).
Incorrect Answers:
B: Zoning is used in Fibre Channel SANs, not iSCSI SANs. Therefore, this answer is incorrect.
C: It is not necessary to add the new LUN to the Static Discovery list. We can perform a rescan which will discover the LUN. Therefore, this answer is incorrect.
D: The question states that other LUNs on the iSCSI array are visible. This means that the CHAP settings must already be correctly configured.
Therefore, this answer is incorrect.
References:
http://pubs.vmware.com/vsphere-55/index.jsp#com.vmware.vsphere.storage.doc/GUID-B538B4B4-FEE2-4C50-9752-50B210118314.html