Obtaining storage for subspaces

After determining that the subspace is available, the server program must obtain storage for the subspaces. As explained in Steps to manage subspaces, it is most efficient to obtain in one request enough storage for all subspaces that the application programs will require. You will need the following information about the application programs running in the address space to estimate the size of your storage request:

The average number of application programs in the application server address space during peak processing periods
The average amount of storage required for an application program and its data
The amount of “surplus” storage you want available to be used by application programs during unusually heavy workloads or for large application programs.

This information might be available from a performance monitoring program. If not, you might want to estimate the storage required and fine-tune the storage request later, after testing your estimate.

In addition, be sure that you request enough storage to allow you to align the storage on a megabyte boundary. To align the storage correctly, you might have to request a good deal more storage than you plan to use.