When a storage lifecycle policy (SLP) writes the first copy of a synthetic full backup to tape, the expiration time of the tape is not set by using the retention period that is specified for copy 1 in the SLP.
Instead, NetBackup sets the expiration time of the tape by using the retention period that is defined in the Synthetic Full schedule of the backup policy.
Note: When a backup policy is under the control of a SLP, the retention period in each schedule is grayed out in the NetBackup administration GUI, but the policy configuration still has a retention period defined for each schedule. This retention period in the policy schedule should not be used when a policy is under the control of a SLP.
NetBackup incorrectly uses the retention period that is defined in the Synthetic Full schedule of the backup policy to set the expiration time on the tape(s) where it writes copy 1 of the synthetic full backup. The default retention period for a schedule is one week.
This can lead to the unexpected result that the tape(s) may expire before the end of the retention period defined in the SLP for copy 1 of the synthetic full backup image.
The expiration time of copy 1 of the synthetic full backup image is set correctly in the NetBackup catalog, using the retention period that is defined for copy 1 in the SLP.
The formal resolution for this issue (Etrack 2849987) is included in the following release:
- NetBackup 7.5 Maintenance Release 4 (220.127.116.11)
Information on NetBackup 18.104.22.168 is available via the Related Article linked below.
Symantec strongly recommends the following best practices:
1. Always perform a full DR backup prior to making any changes to your environment.
2. Always make sure that your environment is running the latest version and patch level.
3. Perform periodic "test" restores.
4. Subscribe to technical articles.
How to Subscribe to Email Notification:
Directly to this Article:
Subscribe to this article by clicking on the Subscribe via email link on this page to receive notification when this article is updated with Release Information.
If you have not received information about this TechNote from the Symantec Email Notification Service as a Software Alert, you may subscribe via email and/or RSS using the links provided at the following page:
This issue affects any policy that satisfies all of the following criteria:
- The policy includes a Synthetic Full backup schedule
- The policy is under control of a storage lifecycle policy (SLP)
- The SLP writes copy 1 to tape
Note: The use of storage lifecycle policies in conjunction with synthetic backups is not a common configuration.
This issue only affects tapes holding copy 1 of the synthetic full backup image.
This issue does not affect normal (non-synthetic) Full backups, Incremental backups or User backups.
This issue affects all versions of NetBackup where storage lifecycle policies are in use (through NetBackup 22.214.171.124).