Keep the following recommendations in mind when planning for your RECON data sets:
Use three RECON data sets: two current and one spare.
Define the three RECON data sets with different space allocations.
Separate the RECON data sets (for example, put them on different devices and channels).
Use dynamic allocation.
Do not mix dynamic allocation and JCL allocation.
Define the RECON data sets for availability, but keep performance implications in mind.