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Backup Tapes being Overwritten

Created: 15 Nov 2011 • Updated: 26 Nov 2012 | 15 comments
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I have 5 backup jobs which run on a Monday night and finish on Tuesday morning using 2 tapes. The first job overwrites the media, the other 4 jobs are set to append to media and terminate if no append able media is found. Backup Byte count for 5 jobs totals 650GB and tape byte count shows 350GB this prompted me to look at doing a restore from the backup tapes and displaying whats on the tapes, only data from the last 2 jobs are available. How can these jobs overwrite data on the tape if the properties of the jobs are set to append to media or terminate if no appendable media?

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Ken Putnam's picture

Hmm

Do all the jobs write to the same media set?

What are the OPP and APP of that media set (Overwiter period and Append period)

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JMCBH's picture

All jobs write to the same media slots which contain the two tapes.

Overwrite protection is set at 1 hour and append period is set to infinite - allow append.

There is a warning saying overprotection period is set to none. I checked under tools > options > media management and it is set as none in there

AmolZeroCool's picture

In the Media management you need to set the overwrite protection period level to "Partial" else BE

will not adhere the rules specified in the media set.

Amol

MCITP | STS | SCP 
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Ken Putnam's picture

Ahh

should have asked about that also

You need to set that to either FULL or PARTIAL, or BackupExec will not apply any protection at all, meaning that any tape that it sees is considered a scratch tape.

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JMCBH's picture

but why did a job set to append to media or terminate overwrite the data?

AmolZeroCool's picture

When Media Overwrite protection is set to NONE, BE overwrites the media irrespective of the media 

set rules and its by Design. Refer to below article.

http://www.symantec.com/docs/HOWTO22315

Amol

MCITP | STS | SCP 
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JMCBH's picture

Would this still apply when the backup job itself has been configured with the settings append to media, terminate job if no appendable media is available?

see attached image for job setting

job_settings.JPG
AmolZeroCool's picture

YES.

Amol

MCITP | STS | SCP 
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JMCBH's picture

would this setting still allow the jobs to append to the two tapes?

AmolZeroCool's picture

I would recommend the below setting for tape backups.

Select the overwrite protection level as "Partial" and when the job begins "append media

else overwrite if no appeanable media available"

Always select "Overwrite" options for backups targeted to disk.

Note: BE will append to the 1st tape assigned for the backup but if the backup is spanning

over multiple tapes then BE will request for an overwritable (scratch) media 2nd tape onwards. 

Amol

MCITP | STS | SCP 
______________________________________________________________
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SOLUTION
JMCBH's picture

Amol,

We have our first backup job of the evening set to overwrite the media set tapes and then the 4 jobs after that to append to media and terminiate if no appendable media is found.

Can i leave the current job set up in place and Select the overwrite protection level as "Partial"

AmolZeroCool's picture

Are you going to use the same tape for all the jobs?

Amol

MCITP | STS | SCP 
______________________________________________________________
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JMCBH's picture

there will be 2 tapes used for jobs mon - thurs, and 4 for the friday jobs

AmolZeroCool's picture

Again i would say. If protection is "Partial" BE will follow the settings mentioned in the

job and media set. If its "None" then BE will keep on overwriting tapes.

Amol

MCITP | STS | SCP 
______________________________________________________________
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JMCBH's picture

Amol

I didnt make that too clear there will be 2 different tapes used mon - thurs, and four new tapes on a friday. I have enabled Partial BE, and see the first job to overwrite the media and the remaining 4 jobs to append to media and terminate if no appendable media. with an overwrite protection of 19 hours which allows all jobs to complete and no data will be overwritten