Performing a planned maintenance by using the IW cache

You can perform a planned maintenance by using IW cache.

Let us assume that we have IW cache on Side A that is hosting applications. IW cache points to a home in Side B. Complete the following steps for a planned maintenance of Side A:
  1. Stop all applications in IW cache (Side A).
  2. Flush the pending queue on IW cache (Side A) to home (Side B) by using mmafmctl Device flushPending -j FileSetName.
  3. Unlink IW cache (Side A).
  4. Start applications at home (Side B).
  5. Relink the cache after maintenance window.
  6. Stop the applications at home (Side B).
  7. Start the applications at cache (Side A).
  8. Schedule the background prefetch if required (Side A).

    The following figure illustrates IW cache (Side A) to home (Side B).

    Figure 1. IW cache (Side A) to home (Side B)
    IW cache (Side A) to home (Side B)