https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234741
Bug ID: 234741
Summary: Loader fails to load from ZFS with two disks in JBOD
configuration
Product: Base System
Version: 12.0-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
After an upgrade of a Hyper-V VM to 12.0, I can no longer boot. The root
filesystem is on ZFS, with two virtual disks in a JBOD configuration (my
preferred configuration for VMs, because it gives a nice easy way of adding
storage: just add more virtual disks as needed and expand the zpool).
The loader fails with the error "all block copies unavailable.". I could still
load the old kernel from the same zpool and boot, and I can boot from the CD
image with currdev and vfs.root.mountfrom set to the ZFS filesystem (so I can,
at least, use the VM - for now, though rebooting involves typing a lot into the
loader prompt).
There's also a suspicious loader error message that loader.lua contains an
invalid character '*' on line 1: loader.lua doesn't contain the character '*'
anywhere.
When the machine was originally installed, it had a single virtual disk in the
zpool, so presumably all of /boot (on zpool/ROOT/default) was on a single disk.
The second virtual disk is larger than the initial one, so it's likely that
blocks in /boot are split over both disks. My guess is that loader is failing
to find blocks that are on the second disk.
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