Basic HyperSwap
Basic HyperSwap® is a copy services solution for z/OS® version 1.9 and later. It provides high availability of data if a disk storage system failure occurs. Basic HyperSwap does not replace a disaster recovery solution. If a session is suspended but the suspend operation was not caused by a HyperSwap trigger, the session is not frozen to ensure that it is consistent.
When HyperSwap is combined with Metro Mirror and Metro Global Mirror replication, you can prepare your system for disaster recovery and ensure high availability of data. If a session is suspended but the suspend operation was not caused by a HyperSwap trigger, the session is frozen to ensure that it is consistent.
- Manages CKD volumes in Metro Mirror to manage synchronous peer-to-peer remote copy (PPRC) relationships.
- Permits only CKD volumes to be added to the HyperSwap session. The graphical user interface (GUI) shows only CKD volumes when you add a copy set. The command-line interface (CLI) does not add a copy set if a fixed block volume is specified.
- Monitors events that indicate a storage device failed.
- Determines whether the failing storage device is part of a Metro Mirror synchronous PPRC pair.
- Determines the action to be taken from policy.
- Ensures that data remains consistent.
- Swaps the I/O between the primary logical devices in the consistency group with the secondary logical devices in the consistency group. A swap can occur from the preferred logical devices to the alternate logical devices or from the alternate logical devices to the preferred logical devices.
Example
Jane is using multiple DS8000 storage systems. The host applications run on a z/OS operating system and the z/OS environment is connected to the DS8000 storage systems. She has a site in Manhattan and a secondary DS8000 in Hoboken. While it is not required that she has a disaster recovery solution in effect, she does need to have a high-availability solution to keep her applications running all the time. Jane is worried that if a volume fails on the DS8000 in Manhattan, her database application might fail. Even a small downtime can be costly to Jane.
Jane uses a Basic HyperSwap session to mirror the data on the DS8000 in Manhattan to the secondary DS8000 in Hoboken. If a volume at the Manhattan site fails, Basic HyperSwap automatically directs application I/O to the mirrored volumes in Hoboken.