Before you start
This "Exploring IMS Disaster Recovery Solutions" series covers non-storage mirroring disaster recovery (DR) 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.
This tutorial describes IMS DR solutions that use the IMS Tools product, IMS Recovery Expert, which uses a recovery resource called a System Level Backup (SLB) to capture the state of the entire IMS production environment. The SLB can be created using storage-based fast replication (FlashCopy technology, for example) to ensure that IMS is unavailable for a couple of seconds or less. Since the SLB can be used for DR and local application recovery purposes, there are solutions shown for both cases.
The IMS Tools Disaster Recovery solutions and two IMS Tools local recovery solutions discussed are:
- IMS disaster restart from SLB only
- IMS disaster recovery and restart using point-in-time recovery (PITR) to the last good log data set
- IMS local application recovery using timestamp recovery (TSR) to a recovery point
- IMS local application recovery using point-in-time recovery (PITR) to any timestamp
The first two solutions show how DR can be accomplished using only the SLB, and how it can be done starting with the SLB and applying updates from the archived log data sets. The third and fourth solutions show how the same SLB created for DR can be reused for local application recovery using two different forms of recovery: Timestamp Recovery (TSR) and Point-In-Time Recovery (PITR).
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:
- Customize the IMS Recovery Expert product
- Create disaster and application profiles
- Create an SLB
- Understand how TSR and PITR work
- Understand the DR process
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