Fixing ZFS Boot Unable to Find Pool in FreeBSD

Tonight I rebooted to change the RAID controller on my new system from RAID to JBOD mode. On boot, I was rudely met with: freebsd boot zfs can't find pool by guid The repair journey: Go for the easy thing first: switch boot disk. No luck. So, time to boot off install media. This system is a Dell T630 with a PERC card in it. The thing to know about these systems is that the mfi(4) driver detects…