Alternate between tests continually

[rsmith-fy]

i've been poking around with fio trying to loosely simulate a failure case for a deployed server.

The attempted test involves a 20s seq write every 40s & a 30s seq read every 40s, continuously looping for a specified duration. There will be a slight overlap between tests. I tried poking around with the various --trigger but couldn't seem to quite work out how to get the timing.

Any insight on how to structure such a test with fio (if possible) would be greatly appreciated.