Volumes Historical Capacity report

Shows the usage of space on volumes over a specified period. Use the report to analyze changes in your volume requirements, particularly the increasing usage of space on thin-provisioned volumes.

Charts

The chart shows the following space statistics for the volume on a storage system:
  • The capacity of the volume
  • The used space on the volume
  • The space on the volume that is used for system management
  • The allocated space on the volume
The chart shows the following space statistics for the volumes in a storage resource group:
  • The capacity of the volumes
  • The used space on the volumes
  • The space on the volumes that is used for system management
  • The allocated space on the volume

If the volume is thin provisioned, the chart shows the total amount of virtual space that is allocated to the volume, and the total amount of real space that is used by the volume.

Report output

The following information is included in reports for a volume on a storage system, or for volumes in a storage resource group:

Storage System Name
A user-defined name of the storage system. If a name was not defined, IBM Spectrum Control shows the name that was defined when the storage system was added for monitoring.
Storage System Configuration
Shows whether a storage system is configured as back-end storage or configured to virtualize back-end storage. If this value is Storage System, the storage system is configured as back-end storage. If this value is Storage Virtualizer, the storage system is configured to virtualize back-end storage.
Storage Pool Name
The name that was assigned to the pool when it was added to the system.
Storage Volume Name
The name that was assigned to the storage volume when it was added to the system.
Date
The date that the data was collected for the report.
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 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 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 Overhead (GiB)
The amount of space that is used for system management. The amount of space also includes space that is reserved for redundancy.