Tape Backup Allocation and Retention Time (probably logical error)

[982134098123]

Hello,
I currently have a Problem, that my Monthly Tapes dont expire, as i expect them to do.
My Media Pool has the Following Allocation Policy:
*-2,3,5,6,8,9,11,12-1 00:00

I want to keep the Backups atleast 2 Months. So my Retention Policy is set to 2 Months.

I now have a Tape from the 1st of June, which in my expectation should be expired. Atm it still reads full. I played with the Retention policy and it changes to expired if i do a Retention Policy of 27 Days.

I assume i got my understanding for the Allocation and Retention policy wrong, but i for now i cant get my head around it.

 

[982134098123]

why backup Job has the following configuration:
Schedule:
*-2,3,5,6,8,9,11,12-1 02:01


and a second one thats starts a day later for the same set:
Schedule:
*-2,3,5,6,8,9,11,12-2 10:00

 

[dcsapak]

maybe the missing bit is this here (from the documentation) :

Retention period starts on the creation time of the next media-set or, if that does not exist, when the calendar event next triggers after the current media-set start time.

so if you set the retention to 2 months, it should start to count from when there is a newer media set, or from when there would be a newer media set

 

[982134098123]

So my current schedule should be good for 3 Months, right? But then i dont get why my 1st of June Backup still is not marked expired.

Okay, i think i get it now. The Retention-time only starts, when a new Media set is startet/would be startet. Because i have a Quarterly in between my Monthlys the Retention-Time just starts a month later. Because a Quarterly was written in July, the 2 Months start counting on the first of August, right?

I thought it would start at write time and only added the Allocation time to the next period to the Retention time.

 

[dcsapak]

So my current schedule should be good for 3 Months, right? But then i dont get why my 1st of June Backup still is not marked expired.

because the next media-set either starts on 2024-08-01 00:00/02:01/ 2024-08-02 10:00 (according to you schedule/allocation policy) and that's the time we're start counting -> ~ 27days

 

[982134098123]

Thanks for clearing that one up, then i just have to reduce the time to one Month (and also adjust that for my weeklys and quarterlys) and im good to go.