> On 21 Jun 2018, at 06:34, Allan Jude <allanj...@freebsd.org> wrote:
>
> On 2018-06-20 21:36, KIRIYAMA Kazuhiko wrote:
>> Hi all,
>>
>> I've been reported ZFS boot disable problem [1], and found
>> that this issue occers form RAID configuration [2]. So I
>> rebuit with RAID5 and re-installed 12.0-CURRENT
>> (r333982). But failed to boot with:
>>
>> ZFS: i/o error - all block copies unavailable
>> ZFS: can't read MOS of pool zroot
>> gptzfsboot: failed to mount default pool zroot
>>
>> FreeBSD/x86 boot
>> ZFS: I/O error - blocks larger than 16777216 are not supported
>> ZFS: can't find dataset u
>> Default: zroot/<0x0>:
>>
>> In this case, the reason is "blocks larger than 16777216 are
>> not supported" and I guess this means datasets that have
>> recordsize greater than 8GB is NOT supported by the
>> FreeBSD boot loader(zpool-features(7)). Is that true ?
>>
>> My zpool featues are as follows:
>>
>> # kldload zfs
>> # zpool import
>> pool: zroot
>> id: 13407092850382881815
>> state: ONLINE
>> status: The pool was last accessed by another system.
>> action: The pool can be imported using its name or numeric identifier and
>> the '-f' flag.
>> see: http://illumos.org/msg/ZFS-8000-EY
>> config:
>>
>> zroot ONLINE
>> mfid0p3 ONLINE
>> # zpool import -fR /mnt zroot
>> # zpool list
>> NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT
>> zroot 19.9T 129G 19.7T - 0% 0% 1.00x ONLINE /mnt
>> # zpool get all zroot
>> NAME PROPERTY VALUE
>> SOURCE
>> zroot size 19.9T
>> -
>> zroot capacity 0%
>> -
>> zroot altroot /mnt
>> local
>> zroot health ONLINE
>> -
>> zroot guid 13407092850382881815
>> default
>> zroot version -
>> default
>> zroot bootfs zroot/ROOT/default
>> local
>> zroot delegation on
>> default
>> zroot autoreplace off
>> default
>> zroot cachefile none
>> local
>> zroot failmode wait
>> default
>> zroot listsnapshots off
>> default
>> zroot autoexpand off
>> default
>> zroot dedupditto 0
>> default
>> zroot dedupratio 1.00x
>> -
>> zroot free 19.7T
>> -
>> zroot allocated 129G
>> -
>> zroot readonly off
>> -
>> zroot comment -
>> default
>> zroot expandsize -
>> -
>> zroot freeing 0
>> default
>> zroot fragmentation 0%
>> -
>> zroot leaked 0
>> default
>> zroot feature@async_destroy enabled
>> local
>> zroot feature@empty_bpobj active
>> local
>> zroot feature@lz4_compress active
>> local
>> zroot feature@multi_vdev_crash_dump enabled
>> local
>> zroot feature@spacemap_histogram active
>> local
>> zroot feature@enabled_txg active
>> local
>> zroot feature@hole_birth active
>> local
>> zroot feature@extensible_dataset enabled
>> local
>> zroot feature@embedded_data active
>> local
>> zroot feature@bookmarks enabled
>> local
>> zroot feature@filesystem_limits enabled
>> local
>> zroot feature@large_blocks enabled
>> local
>> zroot feature@sha512 enabled
>> local
>> zroot feature@skein enabled
>> local
>> zroot unsupported@com.delphix:device_removal inactive
>> local
>> zroot unsupported@com.delphix:obsolete_counts inactive
>> local
>> zroot unsupported@com.delphix:zpool_checkpoint inactive
>> local
>> #
>>
>> Regards
>>
>> [1]
>> https://lists.freebsd.org/pipermail/freebsd-current/2018-March/068886.html
>> [2] https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=151910
>>
>> ---
>> KIRIYAMA Kazuhiko
>> _______________________________________________
>> freebsd-current@freebsd.org mailing list
>> https://lists.freebsd.org/mailman/listinfo/freebsd-current
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>>
>
> I am guessing it means something is corrupt, as 16MB is the maximum size
> of a record in ZFS. Also, the 'large_blocks' feature is 'enabled', not
> 'active', so this suggest you do not have any records larger than 128kb
> on your pool.
>
>
yes indeed, this value printed is 1 << 24 and is current, however, I would
start with reinstalling gptzfsboot on freebsd-boot partition.
rgds,
toomas
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