LUN Utilization Summary

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Capacity Manager > Array Capacity & Utilization > LUN Utilization Summary

If LUNs are not being used efficiently, you want to know so that you can change their allocation or reassign them altogether. Using the LUN Utilization Summary, you can view all the mapping details, such as mount points and file systems.

For NetApp-specific LUN Utilization details,
See LUN Utilization Summary for NetApp 7-Mode .
For EMC VPLEX-specific LUN Utilization details,
See LUN Utilization Summary for EMC VPLEX Arrays.
For IBM XIV-specific LUN Utilization details,
See LUN Utilization Summary for IBM XIV Arrays.
For IBM SVC-specific LUN Utilization details,
See IBM SVC VDisk Summary.
For HP-3PAR- specific LUN Utilization details,
See LUN Utilization Summary for HP3PAR.

This report can be filtered (in the Scope Selector window) to report on the following subsets of data:

Unallocated - These are simply LUNs that have not been allocated to any host. The array has created the LUN, but there is no storage path.
Allocated, but undiscovered - 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.
Allocated, but unused - These are LUNs that have been assigned to a host, but the host has not been placed into a volume group, or a partition has not been created. The array has created the LUN and the storage path exists, making the host and host port information available to Capacity Manager. However, the host storage details--disks, partitions, and volume groups--are not available for the host associated with the storage path.

Note:

The list of Allocated, but unused LUNs will always include the Allocated, but undiscovered LUNs, along with the additional LUNs that may not have been discovered.

Table: LUN Utilization Summary

Column name	Description
	Click on the arrowto drill down to a hierarchical detailed view, including mount point details. This arrow is not displayed if the LUN does not have multiple mount points or has no mount points. For HP 3PAR: LUN refers to a Virtual Volume (VV).
LUN Name	The name of the LUN drills down to the LUN Details report. For HP 3PAR: LUN refers to a Virtual Volume (VV).
RAID Type	The RAID level on the LUN. When the RAID type indicates `Disk`, there is no RAID protection. For HP 3PAR: LUN refers to a Virtual Volume (VV).
Aggregate	(NetApp only).
Volume	(NetApp only).
QTree	QTree associated with the LUN (NetApp only).
Array Group	The group to which the array belongs. See Array Group Details .
Storage Array	The array on which the LUN was created. For HP 3PAR: LUN refers to a Virtual Volume (VV).
Capacity	Size of the volume.
IBM SVC-specific fields for the IBM SVC VDisk Summary report
Name	The volume's user-friendly name.
Cluster	Name of the storage array.
MDisk Group ID	The name of the MDisk group.
Capacity	Total VDisk (LUN) capacity. For HP 3PAR: LUN refers to a Virtual Volume (VV).
Copy Capacity	Copy capacity includes mirrors.
Real Capacity	Allocated VDisk capacity; the capacity that is available to hosts.
Used Capacity	Amount of the allocated VDisk capacity (real capacity) that is used.
Free Capacity	Free = Capacity - Real Capacity.
Uncompressed Used Capacity	For compressed volumes, indicates the amount of data written to the volume before compression.
Compressed	Y if the volume is compressed.
Thin Provisioned	Y if the volume is thinly provisioned.
Mirrored	Indicates if this LUN has a mirror. For HP 3PAR: LUN refers to a Virtual Volume (VV).
Space Efficient	Indicates if this is a thin-provisioned LUN. For HP 3PAR: LUN refers to a Virtual Volume (VV).
IO Group Name	The name of the I/O group to which this VDisk belongs.
Estimated Used	LUN estimated used. For HP 3PAR: LUN refers to a Virtual Volume (VV). Dell EMC Unity: This value is same as 'Allocated' attribute in Dell EMC Unity. Amount of pool space reserved for the LUN, may be less than the total size for a thin LUN. For EMC XtremIO: This field is N/A. See Estimated LUN Usage/Availability.
Estimated Available	Estimated available LUN storage. For HP 3PAR: LUN refers to a Virtual Volume (VV).
# of Hosts	Number of hosts that have allocated LUNs.
Host LUN	The LUN to which the host is mapped. For HP 3PAR: LUN refers to a Virtual Volume (VV).
Mount Point	The host's filesystem mount point for this LUN. It is possible to have zero mount points and filesystems, in the scenario where a LUN has been allocated to the host, but the host has not yet made use of it by creating a filesystem and mounting it. For HP 3PAR: LUN refers to a Virtual Volume (VV).
Filesystem	The host's filesystem or drive name to which the LUN maps. LUNs simply appear as disks to hosts. For HP 3PAR: LUN refers to a Virtual Volume (VV).
Volume Group	The logical collection or volume group to which the volume belongs. For HP 3PAR: Volume group refers to Common Provisioning Group (CPG).
iGroup	Initiator Group name. For NetApp storage, a LUN is mapped to an iGroup--a method of LUN masking.
Host Storage Domain	The name of the host storage domain, a logical group of LUNs that can be accessed by multiple hosts through the same physical storage port, with each host accessing its unique LUN. For security purposes, LUN masking is also coupled with this capability. A host storage domain is Hitachi's name for multi-hosted storage capability. For HP 3PAR: LUN refers to a Virtual Volume (VV).
Array Port WWN	The unique identifier, World Wide Name, of the array port address.
iSCSI Interface	The iGroup contains an iSCSI qualified name that maps to a LUN. (NetApp only).

LUN Utilization Summary

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