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Media question

Created: 22 Jul 2013 • Updated: 23 Jul 2013 | 10 comments
This issue has been solved. See solution.

Hi,

untill 2 years ago we had a bed practis of using multipel tape for one backup job, we have a tape library and we have a full backup job, when we ran this job once a month the data wouldn't fit on one tape so the rest of the data writen to tape 2 and next month full backup the same data wouldn't fit to the current tape 2 and the rest of data goes to tape 3 and next month to tape 4. we stop this practics. and now each full backup has its own tape.

now I have 4 tapes with above story, and I want to reuse the first 2 tapes. I want to be sure if I need to restore data from the tape 3 and tape 4, still I can do so. I heard this is possible but then I have to catalog each of the last 2 tapes again with the option Use storage media-based catalogs is not selected.

is this correct?

Operating Systems:

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CraigV's picture

Well, did 1 job run to Tapes 1 & 2, and then the same job run to tapes 3 & 4?

Have you tried to restore from tapes 3 & 4 to make sure you can restore from them before erasing/reusing tapes 1 & 2?

Thanks!

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Shahin123's picture

when job run the files fil up the tape 1 and the rest of the data on the tape 2, next month the same job run and then we use tape 2 this tape fil up and we use tape 3, next month again tape 3 was used and the rest of the backup witen on the tape 4.

And No I did not try to restore any thing from tape 3 and 4. this is the artical I found out and on the last part says:

If a particular backup job spanned more than one tape, clearing this option also allows you to catalog one of the tapes independently without requiring the other tapes. Backup Exec will catalog the particular tape only.

http://www.symantec.com/business/support/index?pag...

Thanks

CraigV's picture

...this is why you don't append multipl runs to multiple tapes. You could end up in a situation where you are unable to restore some of the data, but not all.

If you have the ability to do so, it might actually be better to duplicate the backups from the 2nd backup run to disk, and then back it up properly before erasing/reusing any earlier tapes!

Thanks!

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Shahin123's picture

So if I understood you correctly even with above artical there is a chance that we cannot restore data from that 3 and 4 right?

and if we want to reuse the tape 1 and 2 we should wait untill we can erase all of the 4 tapes to gether right?

Thanks

CraigV's picture

...it depends on how much flak you will receive if you can't restore data, and how important it is to your business.

From my side, I'd do all 4 at once and make a plan for any immediate backups.

I'd also recommend not tacking too many backup runs onto duplicate tapes, especially if you're using all the space available on a tape. Appending too many backups to tapes places too much of a risk on data restoration if you erase any of the other tapes.

Thanks!

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Shahin123's picture

as I said I correct this mistake by puting one backup job on only one tape.

the tape 3 and 4 has the backup of importent data of year 2011 and becuse right now I dont have new tapes I tought I will try this, and I dont have no time to try to test tape 3 and 4. so I think I will reuse these tape when we are going to arease them all together

but what in a case that the monthly backup wouldn't fit on one tape, and need one full tape and say 600 GB of other tape? should I break the backup job to 2 different parts?

CraigV's picture

Nope, even if you break the job in 2 you're using 2 tapes. Just make sure that once the backup completes, you don't append to the second tape!

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Shahin123's picture

sorry but I dont understand, my full backup job is almost 1.8 TB, and I cannot put in one tape so I need one and half tape, I will break the full backup job to 2 different jobs one job should backup 1.5 TB on one tape and the second job will backup the rest 400 GB on the tape 2. then On the tape 2 I have almost 1 TB free space. I will use the rest of 1 TB free space of the second tape for completaly different backup job (say backup of linux machiens). why shouldnt this work!?

Thanks

CraigV's picture

...which is exactly what I said. You're still using 2 tapes anyway so this wouldn't serve much purpose unless you were trying to speed up your backups.

Whatever you add to tape 2, make sure the append/OPP settings are correct assuming you're using the same media set. If not, you're going to have data not technically required, but because the Append/OPP settings on the tape have been extended for instance, you can't erase the tape until job #2's data on tape 2 is no longer required.

Or buy more tapes if you can...then you can retain separate media for different jobs.

Thanks!

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SOLUTION
MusSeth's picture

i think  best is what craig suggested i.e is duplicate the data from tape to disk to have copy of data in order to safely overwrite the tapes...