# DASD Volume Space

The DASD Volume Space attributes provide status and space information for logical volumes.

Allocated Space MegaBytes: The amount of space in megabytes on this volume which is allocated to data sets.

Cylinder Managed Space: Space on the volume, beginning at cylinder address 65520, is managed only in multicylinder units.

Device Address: The MVS™ device number assigned by HCD, associated with this device.

Device Model: The actual device model. Each device model has unique space and geometry attributes.

Device Type: The MVS device type. For example: 3380, 3390, or 2105.

Extended Address Volume: Volume has more than 65520 cylinders and is an Extended Address Volume.

Fragmentation Index: A number between 0 and 1000 that indicates the degree of scattered free space on the volume. The higher the number, the higher the amount of fragmentation.

Free DSCBs: The number of DSCBs in the VTOC of this volume that are unused.

Free Extents: The amount of free areas on the volume.

Free Space Megabytes: Represents the amount of free space on this volume in megabytes.

Free VTOC Index Records: The number of index records in the VTOC index that are available for use.

Largest Free Extent MB: The size in megabytes of the largest contiguous free area on the volume.

Managed System: The SMS name of this system.

Maximum Free Cylinders: The largest contiguous area of free cylinders on this device.

Maximum Free Tracks: The number of tracks in the largest free extent.

Percent Free Space: The ratio of free space divided by the total space for this volume expressed as a percentage.

Solid State Device: Indicates whether the logical volume is backed by a solid state physical device.

SMS Conversion Status: The SMS conversion status of this volume. Values are: Non-SMS, Initial, Converted, or Excluded.

SMS Status: The SMS volume status for the local system. Values are: Enabled, Quiesced_All, Quiesced_New, Disabled_All, or Disabled_New.

Storage Group Name: The 32-character name of the SMS storage group to which this volume belongs.

Time Stamp: Represents the date and time associated with this row.

Total Capacity Megabytes: The data capacity of this volume in megabytes.

Total Free Cylinders: Represents the total number of unallocated cylinders on this volume.

Total Free Tracks: The total number of separated areas of one track or larger on this volume that are available to allocate.

Track Managed Fragmentation Index: A measure of the degree to which free space in the track managed area on the volume is fragmented. The higher the number, the more severe the track managed area fragmentation.

Track Managed Free Cylinders: Total number of unallocated whole cylinders in the track managed area on this volume.

Track Managed Free Extents: Total number of free extents in the track managed area on this volume.

Track Managed Free Space: Amount of free space in the track managed area on this volume in megabytes.

Track Managed Free Tracks: The total number of free tracks in the track managed area which are not contained in the total number of track managed area free whole cylinders.

Track Managed Largest Free Extent: The size, in megabytes, of the largest contiguous free area in the track managed area on the volume.

Track Managed Maximum Free Cylinders: Largest contiguous area of free cylinders in the track managed area on this device.

Track Managed Maximum Free Tracks: Number of additional free tracks in the extent which contains the Maximum Free Cylinders.

Track Managed Percent Free: Portion of the track managed area on this volume which is currently unused, expressed as a percentage.

Track Managed Total Capacity: Data capacity of the track managed area on this volume in megabytes.

User Group Index: The name of the user-defined group of the DASD volume to which this volume belongs.

Volume: The six-character identifier associated with this logical device.

VTOC Index Status: The status of the VTOC index on this volume. Values are: Enabled, Disabled, Error, OS-VTOC, or Excluded.