Joined: 06 Jun 2008 Posts: 8212 Location: Dubuque, Iowa, USA
1. You may know specifics about an LSRPOOL that would allow you to define the pool better than CICS defaults (such as needing more strings than normal). Much of the time, it's fine to let CICS do the definition but it all depends.
2. CICS would define LSRPOOL 3 using defaults. CICS allows up to (IIRC) 8 LSR pools. If you tell CICS LSR=3, it's not going to change that to LSR=1.
3. Why on earth would you not want to use LSR pools? They are a performance boost in almost all cases. You can specify LSR=NONE for a particular file if you absolutely don't want the buffers shared, but that may cause a performance hit to the region.