vsphere-esxi-vcenter-server-55-storage-guide

Chapter 15 Managing Storage DevicesStorage Refresh and Rescan OperationsThe refresh operation for datastores, storage devices, and storage adapters updates the lists and storageinformation displayed in the vSphere Web Client. For example, it updates such information as the datastorecapacity. When you perform storage management tasks or make changes in the SAN configuration, youmight 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 Serverautomatically rescans and updates your storage. You can disable the automatic rescan feature by turning offthe Host Rescan Filter. See “Turn off Storage Filters in the vSphere Web Client,” on page 147.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 forthis 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).• Add a single host to the vCenter Server after you have edited or removed from the vCenter Server adatastore 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 thedevice. The path reappears on the list as soon as it becomes available and starts working again.Perform Storage Rescan in the vSphere Web ClientWhen you make changes in your SAN configuration, you might need to rescan your storage. You can rescanall storage available to your host, cluster, or datacenter. If the changes you make are isolated to storageaccessed through a specific host, perform rescan for only this host.Procedure1 In the vSphere Web Client object navigator, select a host, a cluster, a datacenter, or a folder that containshosts.2 Select Actions > All vCenter Actions > Rescan Storage.3 Specify extent of rescan.OptionScan for New Storage DevicesScan for New VMFS VolumesDescriptionRescan all adapters to discover new storage devices. If new devices arediscovered, they appear in the device list.Rescan all storage devices to discover new datastores that have beenadded since the last scan. Any new datastores appear in the datastore list.VMware, Inc. 123