Broken ZFS boot on upgrade

Jonathan Anderson jonathan.anderson at
Mon Nov 11 13:10:28 UTC 2019

On 11/11, Andriy Gapon wrote:
> Could it be that you have 2TB+ disk(s) and a relatively old BIOS ?

The first two vdevs use 1 TiB disks, but the third vdev has 3 TiB disks, so that
sounds like a possible explanation... perhaps the contents of /boot previously
resided on one of the 1 TiB vdevs but the new /boot lives on the new vdev
post-upgrade. Is there a zfs admin command to ask which vdev(s) a file or
directory's blocks reside on?

My BIOS is from 2016, so not "old", but possibly old enough?

Thank you,

Jonathan Anderson

jonathan at

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