Under a particular set of circumstances, it is possible for a tape to be prematurely expired, resulting in images managed by a Storage Lifecycle Policy (SLP) to become unavailable before they can be duplicated. In addition, any images placed under a legal hold located on these expired tapes will become unavailable and unrecoverable should the tape be reassigned and overwritten with new data.
This issue is only present in NetBackup 7.5 GA and will not be seen if a Maintenance Release (such as 220.127.116.11 or 18.104.22.168) has been applied to the EMM server.
The formal resolution to this issue (Etrack 2730197) is included in the following release:
- NetBackup 7.5 Maintenance Release 1 (22.214.171.124)
NetBackup 126.96.36.199 is currently available - for more information, please see the Related Article linked below.
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This issue only affects NetBackup 7.5. Other versions (including the current version, NetBackup 188.8.131.52) are not affected by this issue.
This issue will be experienced when ALL of the following conditions are met:
- Retention set in SLP as Expire after copy (see Figure)
- Multiple images are stored on the same media
- One image gets duplicated from media and is then expired as expected
- The entire media could then get expired (Data Loss) if:
- There are no other images on tape with a higher retention level and
- The current image expiration date is in the past
Expire after copy retention is set to retention level 0, which has a default value of 1 week.
If this situation occurs, the media is freed up for further writes which may result in valid data being overwritten, including images placed under a legal hold.