Re: ZFS: I/O error - blocks larger than 16777216 are not supported

From: Toomas Soome <tsoome_at_me.com>
Date: Thu, 21 Jun 2018 08:38:12 +0300
> On 21 Jun 2018, at 06:34, Allan Jude <allanjude_at_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_at_async_destroy                     enabled                                   local
>> zroot  feature_at_empty_bpobj                       active                                    local
>> zroot  feature_at_lz4_compress                      active                                    local
>> zroot  feature_at_multi_vdev_crash_dump             enabled                                   local
>> zroot  feature_at_spacemap_histogram                active                                    local
>> zroot  feature_at_enabled_txg                       active                                    local
>> zroot  feature_at_hole_birth                        active                                    local
>> zroot  feature_at_extensible_dataset                enabled                                   local
>> zroot  feature_at_embedded_data                     active                                    local
>> zroot  feature_at_bookmarks                         enabled                                   local
>> zroot  feature_at_filesystem_limits                 enabled                                   local
>> zroot  feature_at_large_blocks                      enabled                                   local
>> zroot  feature_at_sha512                            enabled                                   local
>> zroot  feature_at_skein                             enabled                                   local
>> zroot  unsupported_at_com.delphix:device_removal    inactive                                  local
>> zroot  unsupported_at_com.delphix:obsolete_counts   inactive                                  local
>> zroot  unsupported_at_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
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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
Received on Thu Jun 21 2018 - 03:38:25 UTC

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