# Volume Group Summary

The Volume Group Summary attributes provide aggregate performance and aggregate space information for SMS storage groups and user DASD groups.

Busy: The percentage of time a resource is busy processing I/O requests. For PAV volumes, this value is normalized by dividing by the number of PAV exposures.

Description: This is a user-defined description used to identify an User DASD Group.

Device MPL: The highest MPL of all volumes associated with this storage group. This value is limited to those volumes that have met the minimum I/O requirements for exception processing.

Free Space Cylinders: The total amount of free space within the storage group, in cylinders. This value does not include the space on volumes in an SMS storage group that have not been converted.

Free Space GB: The total amount of free space within the storage group, in gigabytes. This value does not include the space on volumes in an SMS storage group that have not been converted.

Free Space MB: The total amount of free space within the storage group, in megabytes. This value does not include the space on volumes in an SMS storage group that have not been converted.

Free Space Percent: The free space summed across all volumes within the group, expressed as a percentage. This value does not include volumes which are unavailable for new data set allocation.

Free Space Tracks: The total amount of free space within the storage group, in tracks. This value does not include the space on volumes in an SMS storage group that have not been converted.

Group Name: SMS storage group name or OMEGAMON User DASD Group name.

Group Type: The type of storage group described. Group type can be either of the following:

- SMSGROUP: Volumes owned by an SMS storage group of this name.
- USERGROUP: Volumes that are part of a user-defined group, which can contain SMS-controlled volumes and nonSMS-controlled volumes.

High Busy Percent: The highest percentage of time busy processing I/O requests. For PAV volumes, this value is normalized by dividing by the number of PAV exposures.

High DFW Retry Percent: The highest percentage of DFW Retries. A DASD Fast Write retry occurs when a DASD fast write operation cannot complete due to NVS (nonvolatile storage) constraints.

High Response Time: The highest MSR (millisecond response time) of any volume in the storage group.

High Volume Fragmentation Index: The value of the highest fragmentation index within the group. This value does not include volumes which are unavailable for new data set allocation.

Largest Free Extent Cylinders: The size of the largest free extent within the storage group, in cylinders. This value does not include volumes which are unavailable for new data set allocation.

Largest Free Extent GB: The size of the largest free extent within the storage group, in gigabytes. This value does not include volumes which are unavailable for new data set allocation.

Largest Free Extent MB: The size of the largest free extent within the storage group, in megabytes. This value does not include volumes which are unavailable for new data set allocation.

Largest Free Extent Tracks: The size of the largest free extent within the storage group, in tracks. This value does not include volumes which are unavailable for new data set allocation.

Low Read Hit Percent: The lowest read hit percentage of any volume in this group. A Read Hit occurs when a read request for data is made by the processor and resolved by cache. As a result, the request does not require DASD access.

Low Volume Free Space %: The lowest free space value for a volume within the group, expressed as a percentage. This value does not include volumes which are unavailable for new data set allocation.

Low Write Hit Percent: The lowest write hit percentage of any volume in this group. This value is limited to those volumes that have met the minimum I/O requirements for exception processing.

Managed System: The SMS name of this system.

Non-SMS Volumes: The number of non-SMS volumes in this storage group.

Non-Enabled Volumes: The indicator that this group contains SMS volumes with a status other than ENABLED.

SMS Volumes: Represents the number of SMS volumes in this storage group.

Storage Group Status: Represents the SMS storage group status for the system being monitored.

Storage Group Type: The SMS storage group type.

Time Stamp: The date and time this data was collected.

Total Space Cylinders: The total amount of space within the storage group, in cylinders. This value does not include the space on volumes in an SMS storage group that have not been converted.

Total Space GB: The total amount of space within the storage group, in gigabytes. This value does not include the space on volumes in an SMS storage group that have not been converted.

Total Space MB: The total amount of space within the storage group, in megabytes. This value does not include the space on volumes in an SMS storage group that have not been converted.

Total Space Tracks: The total amount of space within the storage group, in tracks. This value does not include the space on volumes in an SMS storage group that have not been converted.

Total Volumes: The number of volumes in this storage group.

Track Managed Free Space MB: The total amount of track managed free space within the storage group, in megabytes. This value does not include the space on volumes in an SMS storage group that have not been converted.

Track Managed Free Space Cylinders: The total amount of track managed free space within the storage group, in cylinders. This value does not include the space on volumes in an SMS storage group that have not been converted.

Track Managed Free Space GB: The total amount of track managed free space within the storage group, in gigabytes. This value does not include the space on volumes in an SMS storage group that have not been converted.

Track Managed Free Space Percent: The percent of track managed free space in the storage group. This value does not include volumes which are unavailable for new dataset allocation.

Track Managed Free Space Tracks: The total amount of track managed free space within the storage group, in tracks. This value does not include volumes which are unavailable for new dataset allocation.

Track Managed High Volume Frag Index: Value of the highest track managed area fragmentation index within the group. This value does not include volumes which are unavailable for new dataset allocation.

Track Managed Largest Free Extent MB: Size of the largest free track managed area extent within the storage group, in megabytes. This value does not include volumes which are unavailable for new dataset allocation.

Track Managed Largest Free Extent GB: Size of the largest free track managed area extent within the storage group, in gigabytes. This value does not include volumes which are unavailable for new dataset allocation.

Track Managed Largest Free Extent Cylinders: Size of the largest free track managed area extent within the storage group, in cylinders. This value does not include volumes which are unavailable for new dataset allocation.

Track Managed Largest Free Extent Tracks: Size of the largest free track managed area extent within the storage group, in tracks. This value does not include volumes which are unavailable for new dataset allocation.

Track Managed Low Volume Free Space %: Lowest track managed area free space value for a volume within the group, expressed as a percentage. This value does not include volumes which are unavailable for new dataset allocation.

Track Managed Total Space MB: The total amount of track managed space within the storage group, in megabytes. This value does not include the space on volumes in an SMS storage group that have not been converted.

Track Managed Total Space Cylinders: The total amount of track managed space within the storage group, in cylinders. This value does not include the space on volumes in an SMS storage group that have not been converted.

Track Managed Total Space Tracks: The total amount of track managed space within the storage group, in tracks. This value does not include the space on volumes in an SMS storage group that have not been converted.

Track Managed Total Space GB: The total amount of track managed space within the storage group, in gigabytes. This value does not include the space on volumes in an SMS storage group that have not been converted.

Track Managed Used Space Percent: The percentage of track managed used space in the storage group or the User DASD group. This includes both the track and cylinder managed areas of the volumes.

User Group Name: This is a user-defined name used to identify a User DASD group.

Used Space Percent: The percentage of used space in the storage group or the User DASD group. This includes both the track and cylinder managed areas of the volumes.

VTOC Index Status: The worst status of any VTOC index in the group.