SOLVED Cannot delete snapshot with dependent clones

[Daisuke]

I'm trying to delete this snapshot, can you please let me know how to force delete it?

Code:

# zfs get -H -o value -r origin services | uniq
services/iocage/releases/12.2-RELEASE/root@plexmediaserver
# zfs destroy -rR services/iocage/releases/12.2-RELEASE/root@plexmediaserver
cannot unmount '/mnt/services/iocage/jails/plexmediaserver/root': unmount failed
cannot destroy snapshot services/iocage/releases/12.2-RELEASE/root@plexmediaserver: snapshot is cloned

# zfs list -t all -o name,origin,clones | egrep 'NAME|services'
NAME                                                        ORIGIN                                                      CLONES
default/.system/services                                    -                                                           -
default/services                                            -                                                           -
services                                                    -                                                           -
services/iocage                                             -                                                           -
services/iocage/download                                    -                                                           -
services/iocage/download/12.2-RELEASE                       -                                                           -
services/iocage/images                                      -                                                           -
services/iocage/jails                                       -                                                           -
services/iocage/jails/media                                 -                                                           -
services/iocage/jails/media/root                            -                                                           -
services/iocage/jails/plexmediaserver                       -                                                           -
services/iocage/jails/plexmediaserver/root                  services/iocage/releases/12.2-RELEASE/root@plexmediaserver  -
services/iocage/log                                         -                                                           -
services/iocage/releases                                    -                                                           -
services/iocage/releases/12.2-RELEASE                       -                                                           -
services/iocage/releases/12.2-RELEASE/root                  -                                                           -
services/iocage/releases/12.2-RELEASE/root@plexmediaserver  -                                                           services/iocage/jails/plexmediaserver/root
services/iocage/templates                                   -                                                           -

# zdb -e -d services
Dataset mos [META], ID 0, cr_txg 4, 4.84M, 198 objects
Dataset services/iocage/download/12.2-RELEASE [ZPL], ID 2179, cr_txg 85, 402M, 11 objects
Dataset services/iocage/download [ZPL], ID 899, cr_txg 20, 96K, 8 objects
Dataset services/iocage/releases/12.2-RELEASE/root@plexmediaserver [ZPL], ID 399, cr_txg 169, 1.39G, 105936 objects
Dataset services/iocage/releases/12.2-RELEASE/root [ZPL], ID 275, cr_txg 128, 1.39G, 105936 objects
Dataset services/iocage/releases/12.2-RELEASE [ZPL], ID 393, cr_txg 127, 96K, 8 objects
Dataset services/iocage/releases [ZPL], ID 134, cr_txg 28, 96K, 8 objects
Dataset services/iocage/jails/media/root [ZPL], ID 526, cr_txg 210, 2.44G, 69409 objects
Dataset services/iocage/jails/media [ZPL], ID 2700, cr_txg 208, 112K, 10 objects
Dataset services/iocage/jails/plexmediaserver/root [ZPL], ID 286, cr_txg 171, 4.48G, 281714 objects
Dataset services/iocage/jails/plexmediaserver [ZPL], ID 405, cr_txg 170, 112K, 10 objects
Dataset services/iocage/jails [ZPL], ID 1283, cr_txg 24, 104K, 9 objects
Dataset services/iocage/templates [ZPL], ID 1795, cr_txg 30, 96K, 7 objects
Dataset services/iocage/log [ZPL], ID 1539, cr_txg 26, 112K, 9 objects
Dataset services/iocage/images [ZPL], ID 516, cr_txg 22, 1.80G, 9 objects
Dataset services/iocage [ZPL], ID 643, cr_txg 18, 7.02M, 300 objects
Dataset services [ZPL], ID 54, cr_txg 1, 96K, 8 objects
Verified large_blocks feature refcount of 0 is correct
Verified large_dnode feature refcount of 0 is correct
Verified sha512 feature refcount of 0 is correct
Verified skein feature refcount of 0 is correct
Verified userobj_accounting feature refcount of 16 is correct
Verified encryption feature refcount of 0 is correct
Verified project_quota feature refcount of 16 is correct
Verified redaction_bookmarks feature refcount of 0 is correct
Verified redacted_datasets feature refcount of 0 is correct
Verified bookmark_written feature refcount of 0 is correct
Verified livelist feature refcount of 0 is correct
Verified zstd_compress feature refcount of 0 is correct
Verified device_removal feature refcount of 0 is correct
Verified indirect_refcount feature refcount of 0 is correct

 

[Daisuke]

Okay, this is what I did to delete the snapshot:

Code:

# iocage stop plexmediaserver
# zfs send services/iocage/releases/12.2-RELEASE/root@plexmediaserver | pv | zfs receive services/iocage/jails/plexmediaserver/rootnew
# zfs destroy -R services/iocage/jails/plexmediaserver/root
# zfs destroy services/iocage/releases/12.2-RELEASE/root@plexmediaserver
# zfs rename services/iocage/jails/plexmediaserver/rootnew services/iocage/jails/plexmediaserver/root

There is one important detail, root@plexmediaserver was actually empty, so when you do a rename you endup with a empty functional jail.