In 7G snapmirror.conf update usually took effect after couple of minutes (I believe, it was checked every minute). Under 8.0.2 snapmirror.conf changes apparently go unnoticed. I edited snapmirror.conf to disable schedule and continued to get messages on console about inability to transfer (why exactly is unrelated) every minute after that. Only after I quiesced and resumed transfer (QSM) did these messages stop.
Is it a known issue? Is there BURT for it?