@mwl since I have mirrored boot devices on pretty much all zfs systems, I also have two efi and boot partitions - so on systems I'm paranoid about keeping bootable at all cost, I only update bootcode on one set of boot/efi partitions.
If it goes wrong, I boot from the second drive and restore boot&efi from there; otherwise the second drive also gets the updated bootcode after sucessfully booting with that.
S
sko@bsd.network
@sko@bsd.network
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One of the few #sysadmin things that worries me any more is updating boot code after a zpool upgrade.