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Job Size/Policy Using Excessive Amount Of Tapes

Created: 10 Sep 2012 | 15 comments

Hi,

I have a backup policy which is backing up 2 shares on the same server, total data on the server = 850GB.

Whenever a full backup is complete the policy uses 5 LTO3 400GB tapes.

Why 5 & not 3?

Also, within OpsCenter the 'Job Size' report is stating that the job is 1.6TB...!

I have never encountered this before so any advice would be great.

Thanks.

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Will Restore's picture

Set  Maximum number of partially full media  on the Volume Pool in question. 

The default value is zero (0), which indicates that the number of partially full media is unlimited.

Will Restore -- where there is a Will there is a way

markdavies1978's picture

What would be the correct setting to ensure that each tape is fully utilised?

Should this be set on the scratch pool or the pool the tape is assigned too?

Will Restore's picture

Perhaps '3' would be good choice on your example.  The setting is for active pool(s) only, not Scratch.

Will Restore -- where there is a Will there is a way

markdavies1978's picture

I have just has a thought...

As this job is running a duplicate job could this be the reason? e.g. my duplicate pool is full of partially full images where as my other pools are essentially blank media?

bbahnmiller's picture

You may want to also check if you are multi-streaming. That can produce a lot of partially full tapes too.

markdavies1978's picture

No not multistreaming.

I am multiplexing though in order to have multiple copies.

daames's picture

Same problem. On one job, the size of a full backup is 475 GB and the duplicated job always run, 850 GB are now be writed on tape... why ?

This is only one example, same problem on all jobs ...

Will Restore's picture

Multiple copies/duplicating?  That would account for more Kb written and more tape used.

Will Restore -- where there is a Will there is a way

markdavies1978's picture

wr,

I don't think you have understood my point.

Refer to my original post.

Why would 850GB of data span across 5 tapes?

Will Restore's picture

And then you said "multiple copies." thus my question.

Please post complete policy details (bppllist)

Will Restore -- where there is a Will there is a way

markdavies1978's picture

It's ok, think I've figured it out.

What I didn't realise was that 2 jobs come in & complete just before the one in question so the job I'm referring too must fill up the space left behind from the previous 2 jobs before going to the scrath pool for new tapes.

Thanks anyway.

markdavies1978's picture

Also I think the 'Job Size' report must be reporting on both the Primary Copy & the Duplicate Copy sizes totalled together.

Will Restore's picture

:)  that is what I was thinking

Will Restore -- where there is a Will there is a way