Array Capacity Utilization Reports > LUN Utilization Summary
  
Version 9.2.00
LUN Utilization Summary
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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 IBM XIV-specific LUN Utilization details, see LUN Utilization Summary for XIV Arrays.
• For IBM SVC-specific LUN Utilization details, see IBM SVC VDisk Summary.
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.
Click on the arrow to 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. Links to the Array Group Details.
Storage Array
The array on which the LUN was created. For HP 3PAR: LUN refers to a Virtual Volume (VV). Click on the array name link to go to the Array Capacity & Utilization report.
IBM SVC-specific fields for the IBM SVC VDisk Summary report
Capacity
The total capacity (used and unused) of the LUN. For HP 3PAR: LUN refers to a Virtual Volume (VV).
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.
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). See Estimated LUN Usage/Availability.
Estimated Available
Estimated available LUN storage. For HP 3PAR: LUN refers to a Virtual Volume (VV).
Mount Point Used
The amount of storage used by each mount point. These values are displayed when a LUN is expanded to view mount point details. For HP 3PAR: LUN refers to a Virtual Volume (VV).
Host
The name of the host to which storage from the LUN was allocated. For HP 3PAR: LUN refers to a Virtual Volume (VV). Click on a host link to launch the Host Utilization Detail.
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).
Estimated LUN Usage/Availability
Several Capacity Manager reports display certain LUN values as estimated—Estimated Usage, Estimated Available. These values are estimated because of the following logic for deriving the values:
• A volume group has members that are made up of many disks.
• These disks may be local disks or LUNs from one or more arrays.
• Partitions are created from a volume group and then the partition is mounted onto a host, so that the host can use the mounted partition.
• Because of the above sequence, Capacity Manager cannot determine which partition came from which LUN. Therefore, using the available information, the values are estimated.