The timeline for backup and recovery begins when you save information, and ends when your system is fully recovered after a failure.
Refer to this timeline as you read this information and make decisions.
Your strategies for saving and availability determine these things:
- Whether you can successfully complete each step in the chart
- How long it will take you to complete each step
Use the following timeline to develop specific examples. What if the known point (1) is Sunday evening and the failure point (2) is Thursday afternoon? How long will it take to get back to the known point? How long will it take you to get to the current point (6)? Is it even possible with the save strategy that you have planned?
Here is a description for the timeline image:
- Point 1: Known point (last save). Activity occurs on system.
- Point 2: Failure occurs. Hardware repair or Initial Program Load (IPL) occurs.
- Point 3: Hardware is available. Information is restored from backup.
- Point 4: System is recovered to known point 1. Transactions from point 1 to point 2 are recovered.
- Point 5: System is recovered to failure point 2. Business activity from failure point 2 to recovery point 5 is recovered.
- Point 6: System is current.