bumping this thread as i had some time to work on this. My problem above with the no boot has been fixed, i just re-installed a fresh copy of freenas on a usb stick and away we go. on to replacing the failed drives.
so yes, my raid is Z2 and two of the four (2 of 4) drives have failed. so i'm running critical right now with the same degraded message: The volume volume1 state is DEGRADED: One or more devices could not be opened. Sufficient replicas exist for the pool to continue functioning in a degraded state.
So to start replacing drives, what is my next step? Just turn the system off, replace one drive at a time and restart? or can i replace both simultaneously? like i said before, there wasn't an option to select the failed drives and turn them offline. am i going to have swap issues without doing this? or just start replacing stuff, restart, go to the gui and follow the documentation?