0000000433f07816-dmarc-requ...@listserv.ua.edu (Paul Gilmartin) wrote:
On Fri, 15 May 2015 17:14:27 +0000, J O Skip Robinson wrote:
The main problem with using SYS1.BRODCAST for directed messages is that all
users defined at the last ACCOUNT SYNC are candidates for message store. If a
user defined at that time stops logging on, messages--especially JCL
NOTIFYs--will accumulate indefinitely. In my experience, that's why
SYS1.BRODCAST fills up.
Why was this ever designed as a global repository rather than per-addressee?
<snip>
We'd probably need a time machine to even ask why.
But as Skip pointed out, disk and memory were absurdly expensive at the
time by today's standards. Also, when TSO (before the /E) was first
designed I'd think messages were few and far between. Certainly most
systems initially had mere handsful of users, and the number grew slowly
at first. (Anyone remember terminal rooms, and waiting for your turn?)
That the first design lasted as long as it did before it had to be
extended is, in my view, quite a tribute to the original designer! It's
source of continuing amazement to me just how durable many of the early
design decisions were, and continue to be now.
--
John Eells
z/OS Technical Marketing
IBM Poughkeepsie
ee...@us.ibm.com
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