On 07.01.2024 15:51, Karl Denninger wrote:
After that my server fails to boot, gtpzfsboot from second disk (ada1) reports
several "zio_read error: 5" and
ZFS: i/o error - all block copies unavailable
ZFS: can't read MOS of pool zroot
after that.
I've re-created pool from scratch
zpool create znewroot ada0p3 && zfs send zroot | zfs receive znewroot && zpool destroy
zroot && zpool attach znewroot ada0p3 ada1p3
but gptzfsboot still can not boot from it with same diagnostics :-(
Are you SURE gptzfsboot is up to date on that second drive?
If its older that can definitely happen.
I'm 100% sure that gtpzfsboot are from 13.2-RELEASE ISO (system is 13.2-STABLE
stable/13-n257023-d32f39bd5fbf) on both disks. I've reinstalled it more than 10
times now...
Now BIOS set to boot from ada0.
Now I'm booting via "gptboot" at ada0p1/ada1p1 and small freebsd-ufs partition on
ada0p2/ada0p3 with only "/boot" as temporary measure (this partition was created instead
of swap temporary, to revive server).
Unfortunately, it is hard to experiment with different bootcode, as it needs
remote console which is in limited availability (Hetzner!) and don't give you
access to BIOS anyhow.
(it is pity, that our new bootloaders have less features than old 512-byte
"boot0" which allows to select different HDDs without any BIOS interaction! We
can several megabytes of code on these new bootloaders, and still they are DUMB)
--
// Lev Serebryakov
