directly to tape.

Backup

The archive logs are a backup of the active logs. DB2 can create dual archive logs. There is no need for an additional backup of the archive logs.

7.4.1 Storage Class

Storage Class SCDBARCH is an example of a Storage Class for archive logs.

This Storage Class has high availability and good performance.

SCDBARCH

7.4.2Management Class

Two different Management Classes are used for the archive logs. One is used for the primary copy and the other for the secondary copy. Both allow migration of the data sets. The reason for defining two separate Management Classes is to enable a physical separation of the two copies.

The Management Class MCDBICM is used for the image copies retained longest and for the archive logs. This ensures equivalent expiration dates for image copies and archive logs.

The Management Class MCDBLV2 is used for the secondary archives. This will directly migrate the secondary copy to level 2 of DFSMShsm and so ensure a physical separation of the two archive copies.

MCDBICM, used for primary archive log data sets

MCDBLV2, used for secondary archive log data sets

7.4.3Storage Group

Primary and secondary archive logs are allocated on volumes of the SGDBARCH Storage Group. These data sets are migrated independently on different dates. This is determined by their Management Class.

• SGDBARCH

An alternative to the above Storage Group could be a TMM Storage Group, but only for the secondary copy of the archive logs. A TMM Storage Group simulates a tape device on disk. Multiple data sets are placed together on the same tape. This could have a performance impact if this archive log is required for a recovery or a restart.

7.4.4 ACS Example

An example of ACS routines to allocate these SMS classes and Storage Group for archive logs is shown in Appendix B, section B.2, “Archive Logs” on page 191.

7.5 Image Copies

Image copies are the backup of user and system data in a DB2 subsystem. For a well managed backup and recovery policy, the amount of data in image copy data sets exceeds the amount of production data by at least a factor of three. This

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IBM 5695-DF1, 5655-DB2 manual Image Copies, Backup

5695-DF1, 5655-DB2 specifications

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