I have a example that I want to share about Media Multiplexing;
PS-MPX - Policy Media Multiplexing
TD-MPX - Tape Media Multiplexing
TD-MPX = 30
Policy A - PS-MPX = 2
Policy B - PS-MPX = 8
Policy A - 4 Jobs
Policy B - 10 Jobs
Stage 1 - Policy A kicks off: P(A) - Jobs 1 and 2 are active and Jobs 3 and 4 are queued.
Policy B kick off 5 minutes later: P(B) - Jobs 1 to 6 are active, Job 7-10 are queued
Status: 8 Jobs active and 6 Jobs queued.
Stage 2 - Policy A - Job 1 completes, but Policy B - Job 7 becomes active.
Status: 8 Jobs active 5 Jobs queued, 1 Job complete.
Stage 3 - Policy A - Job 2 completes, Jobs 3 - 4 will be still queued. Policy B - Job 8 becomes active.
Status: 8 Jobs active 4 Jobs queued 2 Jobs complete.
Stage 4 - Policy B - Jobs 1-6 completes - Jobs 9 and 10 become active. Policy A - Jobs 3 and 4 are queued.
Status: 4 Jobs Active 2 Jobs queued and 8 Jobs complete.
Stage 5 - Policy B - Jobs 7-9 completes. Policy A - Job 3 becomes active and Job 4 is queued.
Status: 2 Jobs Active, 1 Job queued and 11 Jobs complete
Stage 6 - Policy B - Job 10 completes, Policy A - Job 3 still running and Job 4 becomes active.
Status: 2 Jobs Active, 0 jobs queued, 12 Jobs complete.
Stage 7 - Policy A - Jobs 3 and 4 complete.
Status: 0 Jobs Active, 0 jobs in the queue, 14 Jobs complete.
The question I ask, how is the media multiplexing working on the tape?
The policy that hows the greater PS-MPX 90 % of the time will always finish first. The lower PS-MPX have a difficult time in competing for tape resources.
I am looking forward to any response on this?