It's a theoretical question.. I am purposefully avoiding going into the
details of why and I'm well aware of a more typical implementation like you
outlined. Even in your situation though it's possible (though unlikely) some
sysadmin might do an adhoc backup at 3:15AM causing the situation I'm
describing (data incoming into diskpool while a backup stgpool is
occurring). Unless you also disable sessions right before you do your backup
stgpool and enable afterwards.

Gerald Wichmann
Sr. Systems Development Engineer
Zantaz, Inc.
925.598.3099 w
408.836.9062 c