Joined: 06 Jun 2008 Posts: 8231 Location: Dubuque, Iowa, USA
From the DF/SMS Storage Administration Reference manual:
OPTIMIZE specifies the number of tracks to be read at a time, as follows:
* If n is 1, DFSMSdss reads one track at a time.
* If n is 2, DFSMSdss reads two tracks at a time.
* If n is 3, DFSMSdss reads five tracks at a time.
* If n is 4, DFSMSdss reads one cylinder at a time.
The default is OPT(1). Add OPT(4) after TOL(ENQF) which usually will speed up the dump.
However, as Dick said, an unknown amount of the elapsed time is due to the other work in the system and you're not going to be able to reduce elapsed time by much as long as your dump is having to compete with everything else.