Migrated data set considerations

Data sets that are migrated at the time a System Level Backup is created are not included in the System Level Backup unless they are recalled first.

When the Disaster Recovery profile indicates that the image copy DR method is being used, and IMS database data sets are migrated when the DR preparation job runs, these migrated data sets are ignored and no IDCAMS delete/define commands are created for them.

When performing a System Level Backup, IMS Recovery Expert has two configurable parameters, RECALL_MIGRATED_DATA and RECALL_MIGRATED_WAIT, which control how IMS Recovery Expert will act when it detects that a data set that should be included in the System Level Backup is migrated at backup execution time. For additional information, see (Optional) Configuring the PARMLIB member.

By default, IMS Recovery Expert will not create a System Level Backup if it detects migrated IMS data sets at backup execution time. IMS Recovery Expert can be configured to try to recall the migrated data sets before executing the System Level Backup. IMS Recovery Expert can also be configured to ignore the migrated data sets and continue with creating the System Level Backup. It is strongly advised that IMS Recovery Expert is not configured to ignore migrated data sets unless these data sets can be recovered by other methods when needed.

Migrated user-included data sets do not affect System Level Backup execution and are not handled by the RECALL_MIGRATED_DATA and RECALL_MIGRATED_WAIT parameters. For more information about specifying user included data sets, see Providing IMS system information. Migrated user included data sets will be shown through a subsystem analysis (see Collecting and analyzing data with the System Setup facility), but these data sets should not be allowed to be migrated if they need to be included in the System Level Backup.

When performing DR preparation for the image copy DR method, IMS Recovery Expert has two configurable parameters: DE_RECALL_MIGRATED_DATA and DR_RECALL_MIGRATED_WAIT. These parameters control what IMS Recovery Expert does when it detects that a database data set is migrated at DR preparation time. For additional information, see (Optional) Configuring the PARMLIB member.