[Bug 273772] zpool nested in ZVOL becomes inaccessible when zfsd(8) is running on the host
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Date: Fri, 02 Feb 2024 07:54:33 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273772
--- Comment #11 from Marek Zarychta <zarychtam@plan-b.pwste.edu.pl> ---
Now both: bhyve host and guest are running FreeBSD stable/14. ZFS pools on host
and guest were upgraded. The report is still valid and the issue is persistent.
Maybe the transition to mirror (the guest is nested on a ZVOL of pool with a
top-level-vdev that had previously been removed) has something to do with it
(see bug 273663). The guest is using host's ZVOL zroot/ZVOL/virtbsd as vtbd0.
This is how ZFS looks on the host:
# zpool status zroot
pool: zroot
state: ONLINE
scan: scrub repaired 0B in 00:11:06 with 0 errors on Fri Jan 26 03:21:55 2024
scan warning: skipped blocks that are only referenced by the checkpoint.
remove: Removal of vdev 1 copied 15.1G in 0h0m, completed on Fri May 15
20:04:34 2020
119K memory used for removed device mappings
checkpoint: created Mon Dec 4 20:10:12 2023, consumes 49.6G
config:
NAME STATE READ WRITE CKSUM
zroot ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
da0p2 ONLINE 0 0 0
da1p2 ONLINE 0 0 0
errors: No known data errors
# zpool get all zroot
NAME PROPERTY VALUE SOURCE
zroot size 476G -
zroot capacity 63% -
zroot altroot - default
zroot health ONLINE -
zroot guid 6762271100094851702 -
zroot version - default
zroot bootfs zroot/ROOT/default14 local
zroot delegation on default
zroot autoreplace off default
zroot cachefile - default
zroot failmode wait default
zroot listsnapshots off default
zroot autoexpand off default
zroot dedupratio 1.00x -
zroot free 176G -
zroot allocated 300G -
zroot readonly off -
zroot ashift 0 default
zroot comment - default
zroot expandsize - -
zroot freeing 0 -
zroot fragmentation 58% -
zroot leaked 0 -
zroot multihost off default
zroot checkpoint 49.6G -
zroot load_guid 2254167222130845727 -
zroot autotrim on local
zroot compatibility off default
zroot bcloneused 0 -
zroot bclonesaved 0 -
zroot bcloneratio 1.00x -
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 active 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@large_dnode enabled local
zroot feature@sha512 enabled local
zroot feature@skein enabled local
zroot feature@edonr enabled local
zroot feature@userobj_accounting active local
zroot feature@encryption enabled local
zroot feature@project_quota active local
zroot feature@device_removal active local
zroot feature@obsolete_counts active local
zroot feature@zpool_checkpoint active local
zroot feature@spacemap_v2 active local
zroot feature@allocation_classes enabled local
zroot feature@resilver_defer enabled local
zroot feature@bookmark_v2 enabled local
zroot feature@redaction_bookmarks enabled local
zroot feature@redacted_datasets enabled local
zroot feature@bookmark_written enabled local
zroot feature@log_spacemap active local
zroot feature@livelist enabled local
zroot feature@device_rebuild enabled local
zroot feature@zstd_compress enabled local
zroot feature@draid enabled local
zroot feature@zilsaxattr active local
zroot feature@head_errlog active local
zroot feature@blake3 enabled local
zroot feature@block_cloning enabled local
zroot feature@vdev_zaps_v2 active local
# zfs get all zroot/ZVOL/virtbsd
NAME PROPERTY VALUE SOURCE
zroot/ZVOL/virtbsd type volume -
zroot/ZVOL/virtbsd creation Wed Mar 10 8:59 2021 -
zroot/ZVOL/virtbsd used 109G -
zroot/ZVOL/virtbsd available 144G -
zroot/ZVOL/virtbsd referenced 11.3G -
zroot/ZVOL/virtbsd compressratio 1.13x -
zroot/ZVOL/virtbsd reservation none default
zroot/ZVOL/virtbsd volsize 50G local
zroot/ZVOL/virtbsd volblocksize 8K -
zroot/ZVOL/virtbsd checksum on default
zroot/ZVOL/virtbsd compression lz4 inherited
from zroot
zroot/ZVOL/virtbsd readonly off default
zroot/ZVOL/virtbsd createtxg 5153440 -
zroot/ZVOL/virtbsd copies 1 default
zroot/ZVOL/virtbsd refreservation 51.6G local
zroot/ZVOL/virtbsd guid 1428736673261547338 -
zroot/ZVOL/virtbsd primarycache all default
zroot/ZVOL/virtbsd secondarycache all default
zroot/ZVOL/virtbsd usedbysnapshots 45.8G -
zroot/ZVOL/virtbsd usedbydataset 11.3G -
zroot/ZVOL/virtbsd usedbychildren 0B -
zroot/ZVOL/virtbsd usedbyrefreservation 51.5G -
zroot/ZVOL/virtbsd logbias latency default
zroot/ZVOL/virtbsd objsetid 66109 -
zroot/ZVOL/virtbsd dedup off default
zroot/ZVOL/virtbsd mlslabel none default
zroot/ZVOL/virtbsd sync standard default
zroot/ZVOL/virtbsd refcompressratio 1.21x -
zroot/ZVOL/virtbsd written 85.1M -
zroot/ZVOL/virtbsd logicalused 64.4G -
zroot/ZVOL/virtbsd logicalreferenced 13.6G -
zroot/ZVOL/virtbsd volmode default default
zroot/ZVOL/virtbsd snapshot_limit none default
zroot/ZVOL/virtbsd snapshot_count none default
zroot/ZVOL/virtbsd snapdev hidden default
zroot/ZVOL/virtbsd context none default
zroot/ZVOL/virtbsd fscontext none default
zroot/ZVOL/virtbsd defcontext none default
zroot/ZVOL/virtbsd rootcontext none default
zroot/ZVOL/virtbsd redundant_metadata all default
zroot/ZVOL/virtbsd encryption off default
zroot/ZVOL/virtbsd keylocation none default
zroot/ZVOL/virtbsd keyformat none default
zroot/ZVOL/virtbsd pbkdf2iters 0 default
zroot/ZVOL/virtbsd snapshots_changed Fri Feb 2 4:20:00 2024 -
This is how ZFS looks inside the guest:
[virtbsd] ~# gpart show
=> 40 104857520 vtbd0 GPT (50G)
40 1024 1 freebsd-boot (512K)
1064 94371840 2 freebsd-zfs (45G)
94372904 10484656 3 freebsd-swap (5.0G)
[virtbsd] ~# zpool list
NAME SIZE ALLOC FREE CKPOINT EXPANDSZ FRAG CAP DEDUP HEALTH
ALTROOT
vmzroot 44.5G 8.98G 35.5G - - 32% 20% 1.00x ONLINE
-
[virtbsd] ~# zpool status
pool: vmzroot
state: ONLINE
scan: scrub repaired 0B in 00:00:16 with 0 errors on Sat Jan 27 03:01:33 2024
config:
NAME STATE READ WRITE CKSUM
vmzroot ONLINE 0 0 0
gpt/vmzfs0 ONLINE 0 0 0
errors: No known data errors
[virtbsd] ~# zpool get all vmzroot
NAME PROPERTY VALUE SOURCE
vmzroot size 44.5G -
vmzroot capacity 20% -
vmzroot altroot - default
vmzroot health ONLINE -
vmzroot guid 14496911069470365237 -
vmzroot version - default
vmzroot bootfs vmzroot/ROOT/default local
vmzroot delegation on default
vmzroot autoreplace off default
vmzroot cachefile - default
vmzroot failmode wait default
vmzroot listsnapshots off default
vmzroot autoexpand off default
vmzroot dedupratio 1.00x -
vmzroot free 35.5G -
vmzroot allocated 8.98G -
vmzroot readonly off -
vmzroot ashift 0 default
vmzroot comment - default
vmzroot expandsize - -
vmzroot freeing 0 -
vmzroot fragmentation 32% -
vmzroot leaked 0 -
vmzroot multihost off default
vmzroot checkpoint - -
vmzroot load_guid 9652613418712187666 -
vmzroot autotrim on local
vmzroot compatibility off default
vmzroot bcloneused 0 -
vmzroot bclonesaved 0 -
vmzroot bcloneratio 1.00x -
vmzroot feature@async_destroy enabled local
vmzroot feature@empty_bpobj active local
vmzroot feature@lz4_compress active local
vmzroot feature@multi_vdev_crash_dump enabled local
vmzroot feature@spacemap_histogram active local
vmzroot feature@enabled_txg active local
vmzroot feature@hole_birth active local
vmzroot feature@extensible_dataset active local
vmzroot feature@embedded_data active local
vmzroot feature@bookmarks enabled local
vmzroot feature@filesystem_limits enabled local
vmzroot feature@large_blocks enabled local
vmzroot feature@large_dnode enabled local
vmzroot feature@sha512 enabled local
vmzroot feature@skein enabled local
vmzroot feature@edonr enabled local
vmzroot feature@userobj_accounting active local
vmzroot feature@encryption enabled local
vmzroot feature@project_quota active local
vmzroot feature@device_removal enabled local
vmzroot feature@obsolete_counts enabled local
vmzroot feature@zpool_checkpoint enabled local
vmzroot feature@spacemap_v2 active local
vmzroot feature@allocation_classes enabled local
vmzroot feature@resilver_defer enabled local
vmzroot feature@bookmark_v2 enabled local
vmzroot feature@redaction_bookmarks enabled local
vmzroot feature@redacted_datasets enabled local
vmzroot feature@bookmark_written enabled local
vmzroot feature@log_spacemap active local
vmzroot feature@livelist enabled local
vmzroot feature@device_rebuild enabled local
vmzroot feature@zstd_compress enabled local
vmzroot feature@draid enabled local
vmzroot feature@zilsaxattr active local
vmzroot feature@head_errlog active local
vmzroot feature@blake3 enabled local
vmzroot feature@block_cloning enabled local
vmzroot feature@vdev_zaps_v2 active local
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