Before you start
This "Exploring IMS Disaster Recovery Solutions" series covers non-storage mirroring disaster recovery solutions for the IMS environment. Methods described show how various backup and recovery resources can be combined to reduce time and data loss in the event of a disaster. Storage-based fast replication techniques (like FlashCopy technology) are also shown here with storage-aware IMS Tools that allow a coordinated and consistent recovery point between IMS and DB2 databases.
Part 3 describes the IMS Disaster Recovery (DR) solutions that require backup resources like image copies, change-accumulation data sets and, in some cases, the archived log data sets.
The IMS Base and one IMS Tools Disaster Recovery solutions discussed in this tutorial:
- Timestamp Recovery to Image Copies Only (TSR to IC)
- Timestamp Recovery Using Change Accums (TSR to CA)
- Full Database Recovery to Last Good Archived Log (Full DB Recovery)
- Timestamp Recovery Using Incremental Image Copies Only (TSR to IIC)
This tutorial is the second in a series of four to show you how to use two forms of recovery: timestamp recovery (TSR) for a specific recovery point (RP) and full database recovery to the end of the last good archived log data set sent to the remote site. In the fourth solution, the tools in the IMS Recovery Solution Pack are used to create an incremental image copy (IIC) offline by applying log updates to an existing image copy up through an RP, resulting in a disaster recovery scheme that employs only clean image copies. Each solution in this tutorial requires a certain amount of RECON conditioning.
If you haven't done so, consider downloading the IMS Disaster Recovery Demonstrations, which go hand in hand with this series.
After completing the tutorial, you should be able to:
- Understand how to create RPs
- Understand how TSR and full database recovery work
- Create IICs using the IMS Recovery Solution Pack
- Execute GENJCL to create recovery jobs
- Identify uncommitted updates in the archived log data sets
- Create backup copies of the RECON data set
- Manually condition the RECON data set for recovery at the remote site
You should have basic knowledge of the following:
- z/OS® environment
- IMS operating environment
- IMS commands and procedures
- Internet browser, such as Firefox or Internet Explorer