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Often referred to as orphaned LUNs, these are LUNs that have been assigned to a host, but they have not been discovered and therefore are not seen on the host side. The array has created the LUN and the storage path exists, but there is no access to host port and host information, such as disks, partitions, and volume groups. To make these LUNs visible to the host, a system administrator must execute a LUN scan or, for older OS and volume manager versions, re-boot the system. Otherwise, this storage is not available for mounting filesystems. The LUN scan tells the HBA (host bus adapter) that a LUN has been zoned to the host.

For HP 3PAR: LUNs refer to Virtual Volumes and Volume Groups refer to Common Provisioning Groups.

 

Additional details can be accessed via the following drill-down links in the report:

For descriptions of the displayed fields, see LUN Utilization Summary.