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 (18.104.22.168)
Information on NetBackup 22.214.171.124 is available via the Related Article linked below.
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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 126.96.36.199).