deleting child snapshot but not parent?

[guermantes]

Hi!

I have the following dataset structure for my media library (see image below). I do a periodic recursive snapshot of bibliotek since the data is actually stored in the children. Now I have made some substantial house-cleaning in child dataset annat and would like to delete all snaps of annat so that it rebuilds afresh without the old stuff.

Can I simply delete the annat snapshot without that affecting the other children of bibliotek, or is there some kind of interdepencence between the snaps since they were created by one and the same snapshot task (of bibliotek)?

Code:

TANK/bibliotek@auto-2020-03-08_01-00                                    0      -   256K  -
TANK/bibliotek@auto-2020-04-03_02-45                                    0      -   256K  -
TANK/bibliotek@auto-2020-05-03_02-45                                    0      -   256K  -
TANK/bibliotek@auto-2020-06-03_02-45                                    0      -   256K  -
TANK/bibliotek@auto-2020-07-03_02-45                                    0      -   256K  -
TANK/bibliotek@auto-2020-08-03_02-45                                    0      -   256K  -
TANK/bibliotek@auto-2020-09-03_02-45                                    0      -   256K  -
TANK/bibliotek@auto-2020-10-03_02-45                                    0      -   256K  -
TANK/bibliotek@auto-2020-10-05_03-00                                    0      -   256K  -
TANK/bibliotek@auto-2020-10-06_03-00                                    0      -   256K  -
TANK/bibliotek/musica@auto-2020-03-08_01-00                             0      -  1.68T  -
TANK/bibliotek/musica@auto-2020-04-03_02-45                             0      -  1.68T  -
TANK/bibliotek/musica@auto-2020-05-03_02-45                             0      -  1.68T  -
TANK/bibliotek/musica@auto-2020-06-03_02-45                          272K      -  1.69T  -
TANK/bibliotek/musica@auto-2020-07-03_02-45                          224K      -  1.69T  -
TANK/bibliotek/musica@auto-2020-08-03_02-45                          224K      -  1.70T  -
TANK/bibliotek/musica@auto-2020-09-03_02-45                          336K      -  1.78T  -
TANK/bibliotek/musica@auto-2020-09-08_03-00                          256K      -  1.80T  -
TANK/bibliotek/musica@auto-2020-09-13_03-00                         1.39G      -  1.81T  -
TANK/bibliotek/musica@auto-2020-09-16_03-00                          208K      -  1.81T  -
TANK/bibliotek/musica@auto-2020-09-19_03-00                             0      -  1.81T  -
TANK/bibliotek/musica@auto-2020-10-03_02-45                             0      -  1.81T  -
TANK/bibliotek/video@auto-2020-03-08_01-00                              0      -   208K  -
TANK/bibliotek/video@auto-2020-04-03_02-45                              0      -   208K  -
TANK/bibliotek/video@auto-2020-05-03_02-45                              0      -   208K  -
TANK/bibliotek/video@auto-2020-06-03_02-45                              0      -   208K  -
TANK/bibliotek/video@auto-2020-07-03_02-45                              0      -   208K  -
TANK/bibliotek/video@auto-2020-08-03_02-45                              0      -   208K  -
TANK/bibliotek/video@auto-2020-09-03_02-45                              0      -   208K  -
TANK/bibliotek/video@auto-2020-10-03_02-45                              0      -   208K  -
TANK/bibliotek/video@auto-2020-10-05_03-00                              0      -   208K  -
TANK/bibliotek/video@auto-2020-10-06_03-00                              0      -   208K  -
TANK/bibliotek/video/annat@auto-2020-03-08_01-00                        0      -  1.48T  -
TANK/bibliotek/video/annat@auto-2020-04-03_02-45                        0      -  1.48T  -
TANK/bibliotek/video/annat@auto-2020-05-03_02-45                        0      -  1.48T  -
TANK/bibliotek/video/annat@auto-2020-06-03_02-45                        0      -  1.48T  -
TANK/bibliotek/video/annat@auto-2020-07-03_02-45                        0      -  1.48T  -
TANK/bibliotek/video/annat@auto-2020-08-03_02-45                        0      -  1.48T  -
TANK/bibliotek/video/annat@auto-2020-09-03_02-45                        0      -  1.48T  -
TANK/bibliotek/video/annat@auto-2020-10-01_03-00                     543K      -  1.49T  -
TANK/bibliotek/video/annat@auto-2020-10-02_03-00                     304K      -  1.40T  -
TANK/bibliotek/video/annat@auto-2020-10-03_02-45                     144K      -  1.40T  -
TANK/bibliotek/video/annat@auto-2020-10-04_03-00                     176K      -  1.40T  -
TANK/bibliotek/video/annat@auto-2020-10-05_03-00                     160K      -  1.38T  -
TANK/bibliotek/video/bluray-musik@auto-2020-03-08_01-00                 0      -  1.73T  -
TANK/bibliotek/video/bluray-musik@auto-2020-04-03_02-45                 0      -  1.73T  -
TANK/bibliotek/video/bluray-musik@auto-2020-05-03_02-45                 0      -  1.73T  -
TANK/bibliotek/video/bluray-musik@auto-2020-06-03_02-45                 0      -  1.73T  -
TANK/bibliotek/video/bluray-musik@auto-2020-07-03_02-45                 0      -  1.73T  -
TANK/bibliotek/video/bluray-musik@auto-2020-08-03_02-45                 0      -  1.73T  -
TANK/bibliotek/video/bluray-musik@auto-2020-09-03_02-45                 0      -  1.73T  -
TANK/bibliotek/video/bluray-musik@auto-2020-10-03_02-45                 0      -  1.73T  -
TANK/bibliotek/video/bluray-musik@auto-2020-10-06_03-00                 0      -  1.71T  -

 

[blanchet]

Because you have no cloned snapshot, then all your snapshots are independent, and then you can delete any of them you want without affecting the others.

zfsconcepts.8 — OpenZFS documentation

openzfs.github.io