Mike Walter wrote:
Ed,
Paging and Spooling I/O uses "seldom ending" channel programs for good
performance. If any other I/O happens to that device, it interrupts the
paging or spooling channel program, decreasing performance. Since you
have noticed that you need more page space, you must be doing more paging
- hence you may not want to interrupt the paging I/O channel programs.
Interestingly enough, that sort of code is being removed from z/OS, due
to the use of caching controlers and SAN DASD, where the disk is no
loger one physical device, and it is just as fast to redrive the I/O
than have it sitting around.
Kim Goldenberg
State of NJ - OIT
