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What is the order between new snapshots auto-creation and old snapshot auto-deletion?

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Category:
ontap-9
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core
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Applies to

  • ONTAP 9
  • volume-level Snapshot copies
  • Snapshot  auto-creation\auto-deletion

Answer

ONTAP deletes the oldest snapshot and then generates a new snapshot based on volume snapshot policy 

Additional Information

Example:
lccls910102::> snapshot show -volume vol2;date
                                                                 ---Blocks---
Vserver  Volume   Snapshot                                  Size Total% Used%
-------- -------- ------------------------------------- -------- ------ -----
svm91002 vol2
                  weekly.2023-11-12_0015                  1.26MB     1%   80%
                  weekly.2023-11-19_0015                  1.21MB     1%   79%
                  daily.2023-11-23_0010                   1.16MB     1%   78%
                  daily.2023-11-24_0010                   1.12MB     1%   78%
                  hourly.2023-11-24_0905                   132KB     0%   28%
                  hourly.2023-11-24_1005                   132KB     0%   28%
                  hourly.2023-11-24_1105                   132KB     0%   28%
                  hourly.2023-11-24_1205                   568KB     1%   63%
                  5min.2023-11-25_1555                     136KB     0%   29%
                  5min.2023-11-25_1600                    1.33MB     1%   80%
                  5min.2023-11-25_1605                     132KB     0%   28%
11 entries were displayed.                                                      <<<<<<< Maximum Snapshots for the Schedule of 5min.yyyy-mm-dd_hhmm snapshots is 3.

Node      Date                     Time zone
--------- ------------------------ -------------------------
lccls910102-01
          Sat Nov 25 16:09:59 2023 PRC

lccls910102::> snapshot show -volume vol2;date
                                                                 ---Blocks---
Vserver  Volume   Snapshot                                  Size Total% Used%
-------- -------- ------------------------------------- -------- ------ -----
svm91002 vol2
                  weekly.2023-11-12_0015                  1.26MB     1%   85%
                  weekly.2023-11-19_0015                  1.21MB     1%   85%
                  daily.2023-11-23_0010                   1.16MB     1%   84%
                  daily.2023-11-24_0010                   1.12MB     1%   84%
                  hourly.2023-11-24_0905                   132KB     0%   37%
                  hourly.2023-11-24_1005                   132KB     0%   37%
                  hourly.2023-11-24_1105                   132KB     0%   37%
                  hourly.2023-11-24_1205                   568KB     1%   72%
                  5min.2023-11-25_1600                    1.33MB     1%   86%
                  5min.2023-11-25_1605                     136KB     0%   38%
10 entries were displayed.                                <<<<<<< The oldest snapshot named 5min.2023-11-25_1555 was deleted firstly.

Node      Date                     Time zone
--------- ------------------------ -------------------------
lccls910102-01
          Sat Nov 25 16:10:00 2023 PRC

lccls910102::> snapshot show -volume vol2;date
                                                                 ---Blocks---
Vserver  Volume   Snapshot                                  Size Total% Used%
-------- -------- ------------------------------------- -------- ------ -----
svm91002 vol2
                  weekly.2023-11-12_0015                  1.26MB     1%   79%
                  weekly.2023-11-19_0015                  1.21MB     1%   78%
                  daily.2023-11-23_0010                   1.16MB     1%   77%
                  daily.2023-11-24_0010                   1.12MB     1%   77%
                  hourly.2023-11-24_0905                   132KB     0%   28%
                  hourly.2023-11-24_1005                   132KB     0%   28%
                  hourly.2023-11-24_1105                   132KB     0%   28%
                  hourly.2023-11-24_1205                   568KB     1%   62%
                  5min.2023-11-25_1600                    1.33MB     1%   80%
                  5min.2023-11-25_1605                     136KB     0%   28%
                  5min.2023-11-25_1610                        0B     0%    0%
11 entries were displayed.                                                        <<<<<<< The new snapshot named 5min.2023-11-25_1610 was generated later.

Node      Date                     Time zone
--------- ------------------------ -------------------------
lccls910102-01
          Sat Nov 25 16:10:00 2023 PRC
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