On Tue, Jun 7, 2011 at 2:04 PM, Rory Campbell-Lange
<rory AT campbell-lange DOT net> wrote:
> On 07/06/11, Phil Stracchino (alaric AT metrocast DOT net) wrote:
>> On 06/07/11 12:14, Rory Campbell-Lange wrote:
>> > Does deleting the job remove the data (in this case the data for job
>> > 329) off the tape? That is what I need to do.
>>
>> No, it doesn't.  But you've already said you weren't planning to append
>> anything else to that tape ... right?  As long as the data is copied to
>> where it should be, and logically (at least) purged from that tape, does
>> it matter?  Will the tape take up more space in the library because the
>> end of the tape has been written once with now-discarded data?  Do the
>> extra 1 bits make the tape heavier?
>>
>> If it's really, really important to you that no trace of job 329 remain
>> on that tape, then you need to migrate both job 315 AND job 329 to new
>> media, then purge the old media, manually erase it from beginning to end
>> with something like mt, and then relabel it.  But if it's really that
>> important to you that no trace of data from one job ever remain on a
>> tape used by another, then you need to be erasing and relabelling your
>> tapes between EVERY use.[1]  I'm going to go out on a limb here and
>> guess that you probably don't actually want or need to be doing that.
>
> We provide different tape sets to different companies. It would be
> pretty embarassing if sometime in the future someone reconstructed the
> catalogue and found another company's confidential data on it.
>
> Looks like I will need to zero some tapes.
>

I would fill the tape with garbage data to be sure. Remember writhing
zeros is not very effective since that should compress very well. > 10
to 1.

John

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