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Backup Job cannot append on existing tape and using an overwrite tape instead

Created: 28 Dec 2012 • Updated: 15 Jan 2013 | 10 comments
This issue has been solved. See solution.

Dear all,

Here is the case:

Weekly job A / Weekly job B

Media Set to 1 Week overwrite and infinite append

5 tapes in the pool

Weekly job A set to run with overwrite tape option, as Weekly job B set to run with append option. However Weekly job B never pick up the tapes which job A left, there is still pently of space to use, job B will just pick an overwritable tape to start, did I miss anything? Please advise.

Ed.

Comments 10 CommentsJump to latest comment

Gurvinder Rait's picture

The media which has space available and can be appended by any chance does it show as end marker unreadable. If that is the case the second job would pick up a new media and when its spanning (by design) we will pick a overwritable media

Have you tried to use the 3rd option in the backup job "Append to media, terminate job if no appendable media is available" . Do you run into the same Issue ?

AESM's picture

Hi Gurvinder,

Media did not show as end marker unreadable, job A ran sucessfully and media appeared to be OK / appendable status.

I will try to use the 3rd option during this weekend, will see and revert.

Thanks.

Ed.

pkh's picture

Your problem is because your AP is set to infinite append, so all the tapes in the media set is appendable.  BE will append to the tape with the oldest allocated date.

What you need to do is to set the AP to 6 days.  With this setting, at any one time, only one tape is appendable and BE will append to that tape.  The following week when your Monday job overwrites a new tape, it will become appendable for that week.

AESM's picture

Hi Gurvinder,

Last weekend, I have chosen the last option, however the job B still picked up overwrite tape instead.

Hi PKH,

We have 2 set of tapes(5 tapes for each) which go offsite every week, if I set AP to 6 days appendable, all tapes will end up having the same appendable period.  

pkh's picture

I don't know what is your concern.  AP is measured from the start of the job that overwrites the tape.  If the AP is 6 days, most of the tapes would not be appendable and only 1 tape a week will be appendable.

Gurvinder Rait's picture

Hi Ed,

I am not sure what is the state of the media when you put them in the pool. I would recommend you to move them all to scratch media when you move them so that all are overwritable.

Also it seems that these 5 Tapes you are putting if they are only being used for weekly backup then you can just keep the Append period to 2 or 3 days and keep the overwrite protection period of 4 days so that these are again overwritable when they are put back in the RL.

SOLUTION
pkh's picture

If the AP is 3 days, the Thu. job would not be able to append to the tape that was overwritten on Monday.

Gurvinder Rait's picture

If they are just weekly jobs it would be better to start with scratch media

AESM's picture

After testing for 2 weeks, for my weekly job, i create a new media set which set overwrite period to 1 weeks and append period to 5 days.

this works on my case, thanks all for help.