Journal planning for DS8000® HyperSwap with independent auxiliary storage pools (IASPs)

Journaling is important for improved recovery time for all high availability solutions, and is highly recommended. In the case of IBM® System Storage® based technologies, such as HyperSwap®, it is vital that journaling be used to force write operations to external storage units, since mirroring of data occurs outside of IBM i storage.

Journal management prevents transactions from being lost if your system ends abnormally. When you journal an object, the system keeps a record of the changes you make to that object. Regardless of the high availability solution that you implement, journaling is considered a best practice to prevent data loss during abnormal system outages.