Data for storage system volumes in capacity and relationship reports

You can include general information, capacity data, properties, information about copies of volumes, and other information about storage system volumes in capacity and relationship reports.

Information about storage system volumes

You can create capacity and relationship reports that include the following information:

Storage Volume Name
The name that was assigned to the storage volume when it was added to the system.
Storage Volume Assigned Host Connection
The host connection to which the storage volume is assigned. The host connection is a definition in the storage system that contains the WWPN for the server. The storage system uses the WWPN to assign volumes to servers.
Storage Volume Host Connection OS Type
The operating system type of the server or hypervisor that the volume is assigned to.
Storage System Volume Group ID
The unique identifier for a collection of volumes on DS8000® storage systems. The storage system generates this identifier.
Storage System Volume Group Name
The user-defined name for a collection of volumes on DS8000 storage systems.
Storage System Volume Preferred Node Name
The name of the node that is used for I/O operations for the storage system volume.

Capacity and usage data

You can create capacity and relationship reports that include the following information:

Storage Volume Capacity (GiB)
The total amount of storage space that is committed to a volume.
For thin-provisioned volumes, this value represents the virtual capacity of the volume.
For XIV® systems and IBM Storage Accelerate™, this value represents the physical (hard) capacity of the volume, not the virtual (soft) capacity. For other storage systems, this value might also include overhead space if the pool is unformatted.
Storage Volume Overhead (GiB)
The amount of space that is used for system management. The amount of space also includes space that is reserved for redundancy.
Storage Volume Allocated Space (GiB)
The amount of space that is reserved for a volume. The space that is allocated for a thin-provisioned volume is less than its virtual capacity, which is shown in the Storage Volume Capacity (GiB) property. This value is equal to the value in the Storage Volume Used Space (GiB) property for the following resources:
  • Resources other than those that are running IBM Storage Virtualize™ and are configured as back-end storage
  • Resources that are running IBM Storage Virtualize, are configured as back-end storage, and are not thin-provisioned
Storage Volume Used Space (GiB)
The amount of allocated space that is used by a volume.
For resources that are running IBM Storage Virtualize, you can preallocate thin-provisioned volume space when the volumes are created. In these cases, the Storage Volume Used Space (GiB) might be different than the Storage Volume Allocated Space (GiB). For volumes that are not thin provisioned, the values for Storage Volume Used Space (GiB) and Storage Volume Allocated Space (GiB) are equal.
This value is accurate as of the most recent time that IBM Spectrum® Control collected data about a volume. The value in this property might not be 100% accurate for the current state of volumes. This inaccuracy might occur because data collection is run on a set schedule and the used space on volumes can change rapidly.
Storage Volume Used Allocated Space Percentage
The percentage of reserved space for a volume that is being used. This value is always less than or equal to 100% because a volume cannot use more space than is allocated.
IBM Spectrum Control uses the following formula to determine this value:
(volume used space ÷ volume allocated space) × 100
This property is available only for volumes on resources that are running IBM Storage Virtualize.
Storage Volume Unallocated Space (GiB)
The amount of space in a pool that is not reserved for a volume.
IBM Spectrum Control uses the following formula to determine this value:
capacity - allocated space
Available only for thin provisioned volumes.
Storage Volume Physical Allocation Percentage
The percentage of physical space that is reserved for a volume. This value is always less than or equal to 100% because you cannot reserve more physical space than is available.
IBM Spectrum Control uses the following formula to determine this value:
(allocated space ÷ capacity) × 100
For example, the physical allocation percentage is 25% for a volume size of 200 GiB. Therefore, the space that is reserved for volumes is 50 GiB.
Storage Volume Unused Space (GiB)
The amount of space that is allocated to a volume and is not yet used.
IBM Spectrum Control uses the following formula to determine this value:
allocated space - used space
This property is available only for pools on resources that are running IBM Storage Virtualize.
Storage Volume Shortfall Percentage
The percentage of the remaining unallocated volume space in a pool that is not available to be allocated to a volume.
The higher the percentage, the more critical the shortfall of space.
IBM Spectrum Control uses the following formula to determine this value:
(unallocatable volume Space ÷ volume unallocated space) × 100
You can use this percentage to determine when the amount of overcommitted space in pools reaches a critically high level. For example, the physical space in pools might be less than the committed virtual space. In this case, the pools do not have enough space to fulfill the commitment to virtual space for a volume.
This Storage Volume Shortfall Percentage represents the percentage of the committed virtual space that is not available in a pool. As more space is used over time by a volume while the pool capacity remains the same, this percentage increases.
For example, the remaining physical capacity of a pool is 70 GiB, however, 150 GiB of virtual space is committed to a thin-provisioned volume. If the volume is using 50 GiB, then there is still 100 GiB committed to that volume (150 GiB - 50 GiB). There is a shortfall of 30 GiB (70 GiB remaining pool space - 100 GiB remaining commitment of volume space to the volume). The volume is overcommitted by 30 GiB based on the available space in the pool. The shortfall is 30% when you use the following calculation: 
100 GiB unallocated volume space - 70 GiB remaining
pool space ÷ 100 GiB unallocated volume space × 100
Storage Volume Unallocatable Space (GiB)
The unallocatable storage space in GiB of a thin-provisioned volume. Unallocatable space cannot be supplied by the pool to which the volume belongs.
Storage Volume Uncompressed Capacity (GiB)
The amount of storage space that is used if the compressed volume space is uncompressed. For example, if 100 GiB of uncompressed data is compressed, and the size of the compressed data is 20 GiB, the value is 100.
Storage Volume Tier Capacity (GiB)
The amount of volume tier storage of a particular type. The type is identified in the Storage Volume Tier Type property. The tier is configured to be controlled by the Easy Tier® function.
Storage Volume Tier Available Space (GiB)
The amount of volume tier storage of a particular type that is unused. The type is identified in the Storage Volume Tier Type property. The tier is configured to be controlled by the Easy Tier function.

Component properties

You can create capacity and relationship reports that include the following information:

Storage Volume Type
The type of storage volume. For example, the storage volume can be striped or sequential. This value is only available for resources that are running IBM Storage Virtualize and are configured as back-end storage.
Storage Volume WWN
The worldwide name of the volume.
Storage Volume Fast Write State
Shows whether the cache for a volume on a disk that is managed by a storage virtualizer is empty, contains data, or is corrupted.
Storage Volume Grain Size (KiB)
The grain size with which a thin-provisioned volume was created. This value is typically 32, 64, 128, or 256 KiB. Larger grain sizes maximize performance, whereas smaller grain sizes maximize space efficiency. Grain sizes also limit the maximum virtual space of a volume.
This value is only available for resources that are running IBM Storage Virtualize and are configured as back-end storage.
Storage Volume Is Assigned
Shows whether the volume is assigned to a server. If this value is Yes, the volume is assigned to a server.
Storage Volume Is Auto Expand Enabled
Shows whether a volume or volume copy can allocate new extents from a pool automatically. Volumes or volume copies might allocate new extents to expand the real capacity of the storage virtualizer volume or volume copy. If this value is Yes, the volume or volume copy can allocate new extents from a pool automatically.
Storage Volume Is Encryptable
Shows whether the resource can be encrypted. If this value is Yes, the resource can be encrypted.
Storage Volume Is Encrypted
Shows whether the resource is encrypted. If this value is Yes, the resource is encrypted.
Storage Volume Is Formatted
Shows whether a storage volume is formatted. If this value is Yes, the volume is formatted. This value is only available for resources that are running IBM Storage Virtualize and are configured as back-end storage.
Storage Volume Is Thin Provisioned
Shows whether a pool, volume, or volume copy is thin-provisioned. If this value is Yes, the resource is thin-provisioned.
Storage Volume Metro Mirror Name
The name of the Metro Mirror that keeps the synchronous copy of the storage virtualizer volume.
Storage Volume Mirror Count
The number of mirrors that keep a synchronous copy of the resource.
Storage Volume Throttle
The maximum number of commands that the storage volume can queue.
Storage Volume Warning Level
The percentage of used capacity of the resource at which a warning is generated.
Storage Volume FlashCopy® Relationship
Shows whether a volume on a storage system is in a FlashCopy relationship. This property can contain the following values:
Source Relationship
The volume is the source of the relationship.
Target Relationship
The volume is the target of the relationship.
Both Source and Target Relationship
The volume is both the source and target of the relationship.
Not in a FlashCopy Relationship
The volume is not in a FlashCopy relationship.
Storage Volume Remote Copy Relationship
Shows whether a volume on a storage system is in a remote copy relationship. This property can contain the following values:
Not in a Copy Relationship
The volume is not in a remote copy relationship.
Source Relationship
The volume is the source of the relationship.
Target Relationship
The volume is the target of the relationship.
Both Source and Target Relationship
The volume is both the source and target of the relationship.
Storage Volume RAID Level
The RAID level of a storage volume, such as RAID 5 or RAID 10. The RAID level affects the performance and fault tolerance of the volumes that are allocated from the resource.
Storage Volume Is Compressed
Shows whether the volume is compressed. If this value is Yes, the volume is compressed.
Storage Volume Is Volume Control Manager Database
Shows whether a volume is used as the Volume Control Manager Database. If this value is Yes, the volume is used as the Volume Control Manager Database.
Storage Volume Format
Shows the format of the volume or pool. The format can be a Count Key Data (CKD) format, or a fixed block format.
Storage Volume Serial Number
The serial number or volume ID of the volume.
Storage Volume Number
The number of the volume that is assigned by the system.
Storage Volume Logical Subsystem
The logical subsystem (LSS) to which a volume or pool belongs.
Storage Volume Is Easy Tier
Shows how the Easy Tier function is enabled on a volume. For example, if the value of this column is auto, the Easy Tier function is enabled in automatic mode.
Storage Volume Tier Type
The type of tier that is used on the volume. The tier is configured to be controlled by the Easy Tier function.

Status information

You can create capacity and relationship reports that include the following information:

Storage Volume Status
The condition of the resource, for example normal, warning, or error.
Storage Volume Is Detected
Shows whether the resource was detected the last time that data was collected. If this value is Yes, the resource was detected.
Storage Volume Is Easy Tier
Shows how the Easy Tier function is enabled on a volume. For example, if the value of this column is auto, the Easy Tier function is enabled in automatic mode.

Volume copy information

You can create capacity and relationship reports that include the following information:

Storage Volume Copy ID
The identifier of a volume copy.
Storage Volume Copy Grain Size (KiB)
The grain size with which a thin-provisioned volume was created. This value is typically 32, 64, 128, or 256 KiB. Larger grain sizes maximize performance, whereas smaller grain sizes maximize space efficiency. Grain sizes also limit the maximum virtual space of a volume.
Storage Volume Copy Is Auto Expand Enabled
Shows whether a volume or volume copy can allocate new extents from a pool automatically. Volumes or volume copies might allocate new extents to expand the real capacity of the storage virtualizer volume or volume copy. If this value is Yes, the volume or volume copy can allocate new extents from a pool automatically.
Storage Volume Copy Is Detected
Shows whether the resource was detected the last time that data was collected. If this value is Yes, the resource was detected.
Storage Volume Copy Is Primary
Shows whether the volume copy is the primary volume copy.
Storage Volume Copy Is Thin Provisioned
Shows whether a pool, volume, or volume copy is thin-provisioned. If this value is Yes, the resource is thin-provisioned.
Storage Volume Copy Total Number of Extents
The number of extents that are used by the storage volume copy.
Storage Volume Copy Type
The type of copy of the storage volume. For example, the copy of the storage volume can be sequential, a mirror copy, or another type of copy.
Storage Volume Copy Warning Level
The percentage of used capacity of the resource at which a warning is generated.
Storage Volume Copy Used Allocated Space Percentage
The percentage of reserved space for a volume copy that is being used. This value is always less than or equal to 100% because a volume copy cannot use more space than is allocated.
IBM Spectrum Control uses the following formula to determine this value:
(used space ÷ allocated space) × 100
This property is available only for pools on resources that are running IBM Storage Virtualize.
Storage Volume Copy Used Space (GiB)
The amount of allocated space that is used by a volume copy.
Storage Volume Copy Allocated Space (GiB)
The amount of space that is reserved for a volume copy.
The space that is allocated for a thin-provisioned volume copy is less than its virtual capacity, which is shown in the Storage Virtualizer Capacity (GiB) property.
For volume copies that are not thin provisioned, this value is equal to the value of the Storage Volume Copy Used Space (GiB) property.
Storage Volume Copy Unallocated Space (GiB)
The amount of space in a pool that is not reserved for a volume copy.
IBM Spectrum Control uses the following formula to determine this value:
capacity - allocated space
Storage Volume Copy Physical Allocation Percentage
The percentage of physical space that is reserved for a volume copy. This value is always less than or equal to 100% because you cannot reserve more physical space than is available.
IBM Spectrum Control uses the following formula to determine this value:
(allocated space ÷ capacity) × 100
For example, the physical allocation percentage is 25% for a total pool size of 200 GiB. Therefore, the space that is reserved for volume copies is 50 GiB.
Storage Volume Copy Unused Space (GiB)
The amount of space that is allocated to a volume copy and that is not yet used.
IBM Spectrum Control uses the following formula to determine this value:
allocated space - used space
This property is available only for pools on resources that are running IBM Storage Virtualize.
Storage Volume Copy Shortfall Percentage
The percentage of the remaining unallocated volume copy space in a pool that is not available to be allocated to a volume copy.
This value represents the percentage of the committed virtual space that is not available in a pool. As more space is used over time by a volume while the pool capacity remains the same, this percentage increases.
The higher the percentage value is, the more critical the shortfall of space is.
IBM Spectrum Control uses the following formula to determine this value:
(unallocatable space ÷ (capacity – real capacity)) × 100
You can use this percentage to determine when the amount of overcommitted space in a pool reaches a critically high level for the volume. For example, the physical space in a pool might be less than the committed virtual space. In this case, the pool does not have enough space to fulfill the commitment to virtual space for a volume.
For example, the remaining physical capacity of a pool is 70 GiB, however, 150 GiB of virtual space is committed to a thin-provisioned volume. If the volume uses 50 GiB, 100 GiB is, nevertheless, committed to that volume (150 GiB minus 50 GiB). There is a shortfall of 30 GiB when you use the following calculation:
(100 GiB remaining commitment of volume space to 
the volume - 70 GiB remaining pool space)
The volume is overcommitted by 30 GiB based on the available space in the pool. The shortfall is 30% when you use the following calculation:
(100 GiB unallocatable volume copy space - 70 GiB
remaining pool space) ÷ 100 GiB unallocated volume space × 100
This property is available only for volume copies that are thin provisioned.
Storage Volume Copy Unallocatable Space (GiB)
The unallocatable storage space in GiB of a thin-provisioned volume copy. Unallocatable space cannot be supplied by the pool to which the volume copy belongs.
Storage Volume Copy Is Compressed
Shows whether the volume copy is compressed. If this value is Yes, the volume copy is compressed.
Storage Volume Copy Uncompressed Capacity (GiB)
The amount of storage space that is used if the compressed space on the volume copy is uncompressed. For example, if 100 GiB of data is compressed, the value is 100.