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Cisco Bug: CSCvt73209 - Scheduled backups executed one hour early or later when DST takes effect

Last Modified

Oct 22, 2020

Products (1)

  • Cisco Emergency Responder

Known Affected Releases

12.5(1.19000.38)

Description (partial)

Symptom:
The offset by 1 hour was built in to make sure that you do not lose those backups scheduled between 2:00 am and 2:59 am at the moment that  Daylight Saving Time (DST) starts or ends.
However, "Next Occ" value is not automatically fixed and subsequent backups are taking place one hour early or later than the configured time in Disaster Recovery System> Backup> Scheduler.
Note: DST date changes according to the country. 

You can confirm if the backups are offset with the following logs:

From the "file view install system-history.log":

[+] Scheduled backups worked at the configured time (2:20 am):
08/23/2019 02:20:03 | root: DRS Backup UCMVersion:12.5.1.19000-38 Start
08/23/2019 02:22:09 | root: DRS Backup UCMVersion:12.5.1.19000-38 Success

[+] DTS ended at 2:00 am (11/03/2019 in US), so the backup time was moved 1 hour (from 2:20am to 1:20am)
11/03/2019 01:20:03 | root: DRS Backup UCMVersion:12.5.1.19000-38 Start
11/03/2019 01:22:09 | root: DRS Backup UCMVersion:12.5.1.19000-38 Success

[+] Subsequent backups happened at the incorrect scheduled time:
11/04/2019 01:20:03 | root: DRS Backup UCMVersion:12.5.1.19000-38 Start
11/04/2019 01:22:09 | root: DRS Backup UCMVersion:12.5.1.19000-38 Success

[+]  DTS began at 2:00 am, the backup was moved from 1:20 am to 2:20 am : 
03/08/2020 02:20:02 | root: DRS Backup UCMVersion:12.5.1.19000-38 Start
03/08/2020 02:22:15 | root: DRS Backup UCMVersion:12.5.1.19000-38 Success

[+] Subsequent backups happened at the correct scheduled time:
03/26/2020 02:20:02 | root: DRS Backup UCMVersion:12.5.1.19000-38 Start
03/26/2020 02:22:15 | root: DRS Backup UCMVersion:12.5.1.19000-38 Success

From the DRS logs:

[+]  Backups happening at the incorrect scheduled time:
2019-11-04 01:20:00,002 INFO [Timer-0] - PrimaryScheduleTask.runTask:  Running Schedule=
               UniqueID                                        = Test2_Daylight
               Status                                              = RUNNING
               Occurance                                      = 76
               Repeatability                                 = Daily
               RepeatInterval                              = 1
               OriginalExecTime                          = Fri Aug 23 02:20:00 CDT 2019
               FirstOccurance                              = Fri Aug 23 02:20:00 CDT 2019
               Last Occ                                          = Mon Nov 04 01:20:00 CDT 2019
               Next Occ                                         = Tue Nov 05 01:20:00 CDT 2019
               TaskID                                             = drfSchedule0

[+]  Backups happening at the correct scheduled time (during DST):
2020-03-26 02:20:00,002 INFO [Timer-0] - PrimaryScheduleTask.runTask:  Running Schedule=
               UniqueID                                        = Test2_Daylight
               Status                                              = RUNNING
               Occurance                                      = 76
               Repeatability                                 = Daily
               RepeatInterval                              = 1
               OriginalExecTime                          = Fri Aug 23 02:20:00 CDT 2019
               FirstOccurance                              = Fri Aug 23 02:20:00 CDT 2019
               Last Occ                                          = Thu Mar 26 02:20:00 CDT 2020
               Next Occ                                         = Fri Mar 27 02:20:00 CDT 2020
               TaskID                                             = drfSchedule0

Conditions:
Backups scheduled between 2:00 am and 3:00 am.
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