Page 3 of the Management Class Define panel contains the management class backup attributes. (For objects, see Defining class transition attributes.)

Backup Frequency

For DFSMShsm, the Backup Frequency attribute specifies how many days must elapse before DFSMShsm can back up data sets that have changed since the last backup. If you want to back up changed data sets every time that DFSMShsm processes the volumes containing them, specify 0. The default is 1.

For DFSMSdfp OAM object support, if Auto Backup = 'Y', the Backup Frequency attribute specifies when the first backup copy of an object is to be written. If 0 is specified, then OAM will schedule a backup copy at the time the object is initially stored. If non-zero is specified then OAM will schedule backup copy(s) to be written during the OAM Management Component (OSMC) storage group processing cycle. The default is 1.

Number of Backup Vers

Specifies the maximum number of backup versions to retain for a data set. The default is 2 if the data set still exists and 1 if it has been deleted.

Creating a new backup version when the number of backup versions already equals the value specified for the appropriate Number of Backup Vers attribute (Data Set Exists) causes the oldest version of the appropriate type to be deleted.

The number of backup versions is used to determine whether OAM should write one or two backup copies of the objects, when you activate the SECONDBACKUPGROUP function for objects using SETOSMC in the CBROAMxx member of PARMLIB. If the number of backup versions is greater than 1 and AUTO BACKUP is Y, OAM will create two backup copies. When the original object is expired or deleted, all backup copies are also deleted.

Retain Days Only Backup Ver

Indicates how many days to keep the most recent backup version of a deleted data set, starting from the day DFSMShsm detects it has been deleted. This attribute applies only when a data set no longer exists on primary (level 0) or migrated (levels 1 and 2) storage. The default is 60.

This field does not apply to objects. Backup copies of objects are not retained when the original object is deleted.

Retain Days Extra Backup Vers

Indicates how many days to keep backup versions other than the most recent one, starting from the day backups were created. It applies only when more than one backup version exists, and when a data set has low activity. This attribute applies whether the data set has been deleted or not. The default is 30.

The number of extra versions is the number of backup versions minus one. If you specify 1 for Number of Backup Vers, there are no extra versions. For example, if you specify 3 for Number of Backup Vers (Data Set Deleted), the number of "extra" versions for deleted data sets is 2. These 2 versions are managed according to the Retain Days Extra Backup Vers attribute. Any other versions that may have existed when the data set was deleted will be deleted the next time EXPIREBV is processed.

Admin or User Command Backup

Indicates if both the end user and the storage administrator can issue command backups of the data sets in this management class, if only the storage administrator can, or if neither of them can. The Admin or User command Backup field is required, and has a default value of BOTH. Otherwise, the remaining fields are optional.

BOTH

Indicates that both storage administrators and users can perform command backups against these data sets.

ADMIN

indicates that only storage administrators can perform command backups against these data sets.

NONE

indicates that neither storage administrators or end users can perform command backups.

If you specify BOTH or ADMIN in the Admin or User Command Backup field, the remaining fields on this panel are required. If the value is BOTH or ADMIN, then AUTO BACKUP specifies whether these data sets are eligible for automatic backup.

Auto Backup

Is required, and has a default value of Y. If you specify Y in the Auto Backup field, the remaining fields on this panel are required. Otherwise, the remaining fields are optional.

OAM backs up the object during the first management cycle after the object is assigned to a management class requiring backup. This can occur when the object is stored or when its management class is changed by you or by a class transition. Backup copies of an object are deleted when the object is deleted. No archived copy is saved.

Backup Copy Technique

Specifies whether concurrent copy should be used during data set backup processing.

When deciding whether or not to use concurrent copy for a particular dump or copy operation, you need to decide why you are making a copy of the data. If the intention of the copy is to capture a point-in-time image of the data at a specific time, concurrent copy might not be appropriate. When you use concurrent copy there is always a chance that a dump or copy operation does not complete once you have started to make updates to the data. If this happens, the specific point-in-time is lost and you might not be able to recover an image of the data at that time.

AR|R

indicates DFSMSdss keyword CONCURRENT(ANYREQ)

VR

indicates DFSMSdss keyword CONCURRENT(VIRTUALREQ)

CR

indicates DFSMSdss keyword CONCURRENT(CACHEREQ)

AP|P

indicates DFSMSdss keyword CONCURRENT(ANYPREF) or CONCURRENT

VP

indicates DFSMSdss keyword CONCURRENT(VIRTUALPREF)

CP

indicates DFSMSdss keyword CONCURRENT(CACHEPREF)

S

indicates not specifying CONCURRENT keyword to DFSMSdss. This is the default.

Recommendation: Avoid specifying conflicting conditions in the storage class and the management class. For example, if you specify Backup Copy Technique as R (required) in the management class and Accessibility as NOPREF in the storage class, you would be requesting concurrent copy for backup while having placed the data set on a device that does not support concurrent copy, which would result in the backup failing. Specifying the backup copy technique option in the management class in no way affects the placement of data sets on a concurrent copy volume.

After you specify the backup attributes, issue the DOWN command to see the next page of the Management Class Define panel, on which you can specify the object attributes.