December 2017
Beginner
598 pages
14h 7m
English
Content preview from Mastering VMware vSphere 6.5
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Storage masking and filtering
Sometimes you need to hide some disks in order to protect them from possible usage. This operation is called LUN masking (at host side), and before vSphere 6.0, was also recommended before un-presenting a LUN (at storage side) to avoid the All-Paths-Down (APD) condition. Starting with ESXi 6.0 is now possible; just unmount the datastore.
For more information, see KB 1009449—Masking a LUN from ESX and ESXi using the MASK_PATH plug-in (https://kb.vmware.com/kb/1009449). Also note that vCenter automatically hides some LUNs; all that are already mounted or used as RDM disk, but only for hosts or VM managed by the same vCenter.
You can control this behavior using those vCenter Server advanced settings:
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