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If scheduled Snapshot copy creation fails

Scheduled Snapshot copy creation might fail for various reasons, such as a volume being unavailable. In such cases, Data ONTAP attempts to create a Snapshot copy, when possible, outside the schedule.

If a scheduled Snapshot copy creation fails, Data ONTAP checks the Snapshot copies present in the volume. The checks performed and the actions taken depend on the type of scheduled Snapshot copy creation that failed. The process is described in the following list:
  1. When a volume becomes available again for creating a Snapshot copy, Data ONTAP checks whether any Snapshot copies were created during a time period represented by period_snap. period_snap is a variable representing a time period that depends on the type of Snapshot copy schedule, as shown in the following table:
    Type of Snapshot copy schedule Value of the period_snap variable
    Weekly 3 days
    Nightly 3 days
    Hourly 12 hours
    Note: You cannot change the value of period_snap.
  2. The check in the previous step returns one of the following values:
    If the check returns... Then...
    Yes (One or more Snapshot copies were created in the period_snap period) Data ONTAP performs Step 3.
    No (Snapshot copies were not created in the period_snap period) Data ONTAP performs Step 4.
  3. Data ONTAP checks whether any scheduled Snapshot copy creations failed after the most recent Snapshot copy. This check returns one of the following values:
    If the check returns... Then...
    Yes (One or more scheduled Snapshot copy creations were missed) Data ONTAP creates a Snapshot copy.
    No (No scheduled Snapshot copy creation was missed) Data ONTAP does not create a Snapshot copy.
  4. Data ONTAP checks whether any scheduled Snapshot copy creation have failed in the past 25 minutes. This check returns one of the following values:
    If the check returns... Then...
    Yes (A scheduled Snapshot copy creation was missed in the past 25 minutes) Data ONTAP creates a Snapshot copy.
    No (No scheduled Snapshot copy creation was missed in the past 25 minutes) Data ONTAP does not create a Snapshot copy.