Forum Discussion

krono's avatar
krono
Level 3
17 years ago

Retention Period Problem

Hello,   We have 7 servers to backup during the night. We are using Maxell ULTRIUM LTO 2 tapes into a Scalar robot. Normaly the backup takes two tapes. But sometimes it takes 3 tapes. I don't uders...
7.1.x and Earlier
Backup and Recovery
NetBackup
  • Andy_Welburn's avatar
    Andy_Welburn
    17 years ago
    krono wrote:

    How is it possible to append on a media ??? I never set this.

    This is default (only?) action. If there is ACTIVE media in the Volume Pool (i.e. space left on tape) then when a backup starts it will use that tape from the Volume Pool. If there are no ACTIVE media in the Volume Pool (i.e. FULL/no space left on tape) then when the backup starts it will assign a tape from the Scratch Pool (if one is configured). If there are no ACTIVE tapes available and a Scratch Pool is NOT configured then the backup will fail.

    krono wrote:
    I believed that there is only two possibilities. If the tape is available it takes it and overwrite everything, or the tape is not available and it take a tape from the scratch pool...

    Will only 'overwrite' everything IF all images have expired (Time Assigned column in Media/Volume Pool will be blank). Yes, if no tape available it will take a tape from Scratch.

    krono wrote:

    In which situation the policy will perform an append to media instead of an overwrite ?

    See above - will append if tape available & ACTIVE (not FULL), 'overwrite' only if ALL images have expired.

    krono wrote:

    When I perform a MediaWritten on the tape which is full, i can see old backups of more than one month !! How is it possible that the tape is full but contains old backups that are expired due to retention period ?

    What's the latest/most recent expiry of the images? Possibly newer images appended to this tape. Could be that this tape is frozen.

krono's avatar
krono
Level 3
16 years ago

We have tapes for every day of the week. So we want to keep datas for one week so we setup one week of retention. But because of the retetion period starts at the end of the backup, eg 4 hours latter, when the backup starts the next week at 00:00, it perform an append because of the retention period of one week put the tape in the scratch pool only at 4:00 am...

 

I would to avoid append-write on the media...