DOCUMENTATION: The behavior of backups with a calendar schedule changes in 6.5.2 / 6.5.2A when the backup window spans midnight. Backups for a run day will always become due at midnight (the start of the run day).

Problem

DOCUMENTATION: The behavior of backups with a calendar schedule changes in 6.5.2 / 6.5.2A when the backup window spans midnight. Backups for a run day will always become due at midnight (the start of the run day).

Solution

Manuals:
NetBackup 5.0 System Administrator's Guide, Volume I for UNIX (page 178)
NetBackup 5.0 System Administrator's Guide, Volume I for Windows (page 179)
NetBackup 5.1 System Administrator's Guide, Volume I for UNIX (page 179)
NetBackup 5.1 System Administrator's Guide, Volume I for Windows (page 180)
NetBackup 6.0 System Administrator's Guide, Volume I for UNIX and Linux (page 125)
NetBackup 6.0 System Administrator's Guide, Volume I for Windows (page 133)
NetBackup 6.5 Administrator's Guide for UNIX and Linux, Volume I (pages 149-151)
NetBackup 6.5 Administrator's Guide for Windows, Volume I (pages 155-157)

Modification Type: Correction/Supplement

Modification:
Scheduled backup jobs run much earlier in the day than expected.  Scheduled backups may run more than once in the 24 hour period immediately after upgrading from an earlier release to NetBackup 6.5.2 or 6.5.2A.

Details:

In releases prior to NetBackup 6.5.2:

In releases prior to NetBackup 6.5.2, if a window in a Calendar Schedule spans midnight, backups scheduled to run on the new day do not become due at midnight (the start of the run day).  For the purposes of Calendar Scheduling, if the backup window for a run day extends past 23:59:59 into the following day, the portion of the window after midnight is treated as a continuation of the backup window for the previous day (the day on which the window opened).  Backups scheduled for a particular run day only become due at the time when the backup window for that day opens.  If a Calendar Schedule is configured to run on every Monday and Tuesday, and a backup window has been configured to open at 22:00:00 on each day, and close at 06:00:00 on the following day, then Tuesday's backups will become due at 22:00:00 on Tuesday.  Tuesday's backups will not become due 00:00:00, even though a backup window is already open at that time - this is because the part of the backup window after midnight is determined to be a continuation of Monday's backup window, which opened two hours earlier at 22:00:00 on Monday.

This behavior is not as documented in the How Calendar Scheduling Interacts with Daily Windows section of the NetBackup 5.1, 6.0 and 6.5 System Administrator's Guide Volume I (both UNIX and Windows versions).  The behavior of the scheduler was changed after the release of NetBackup 5.1, to allow flexibility in the time of day when Calendar backups are started, but the change was overlooked when the documentation was updated for NetBackup 6.0 and 6.5.

In NetBackup 6.5.2 and 6.5.2A:

The NetBackup scheduler has been re-engineered to improve performance and reliability.  Calendar Scheduling under NetBackup 6.5.2 (and  by extension, 6.5.2A) has been designed to work as documented in How Calendar Scheduling Interacts with Daily Windows.  If a backup window for a Calendar Schedule spans midnight, backups scheduled to run on the new day will immediately become due at midnight.  This is not the same as the behavior of the scheduler prior to NetBackup 6.5.2, and even though it is working as documented in the NetBackup 6.5 System Administrator's Guide Volume I, it has been decided NetBackup 6.5.3 and later releases will revert back to the pre-6.5.2 behavior.

Until NetBackup 6.5.3 is released, it is possible to revert back to the pre-6.5.2 Calendar Scheduling behavior.  Please contact NetBackup Technical Support and reference this document ID and ET1322956 to obtain a fix for this issue:

 http://www.symantec.com/business/support/contact_techsupp.jsp?pid=15143

In NetBackup 6.5.3 and future releases:

In NetBackup 6.5.3 and later, the behavior of Calendar Scheduling will revert back to that of releases prior to NetBackup 6.5.2 (see above).

The documentation section How Calendar Scheduling Interacts with Daily Windows in the NetBackup System Administrator's Guide, will be corrected in the next major release of NetBackup.


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