reliability of information storage on tape

Question

Hi to all !! Help me please, with some questions about NetWorker: 1) tell me what the likelihood that information will not be considered from tape 2) Can I verify that the tape is read? How? Thanks...

DavidHampson · Answer

Sorry but I have no idea what you are asking in the first part of the question. Could you explain what your concern is a little more?

If you want to verify a tape you can use the scanner command with the -n switch (will not amend indexes or media database) - this is something you almost never will need to do. If you want to see if any data is restored from a tape you can use mminfo:

mminfo -q volume=A12345 -r read

You will need to check the logs for further information about what is restored.

Pavel3 · Answer

I want to be sure that i can read the information from tape.And if i can check reading the tape, i want to know how.

amediratta · Answer

The only way I know is to test a recovery from that tape and keep it in safe conditions that do not spoil the tape.

DavidHampson · Answer

The scanner command is the best test the tape is readable; you could also do a recovery to prove you can get data back. Is there a reason why you are doubting the reliability of your tape backups?

DavidHampson · Answer

Try this one then:mminfo -q volume=1 -r writtenDo a restore of something on that tape and run your command again - does it still return 0KB?

Pavel3 · Answer

If I run this command:mminfo -q volume=1 -r readI have only one answer:0KBthats all. But I have information on this tape.

Pavel3 · Answer

this command show me information volume on tape25 GBBut i don't see, that something happened with the tape

Pavel3 · Answer

Yes? i can restore data from this tape.

DavidHampson · Answer

Well, have you read any data from the volume?

ble1 · Answer

Hi to all !!Help me please, with some questions about NetWorker:1) tell me what the likelihood that information willnot be considered from tape It's always possible things will break somewhere including tape itself. If you keep your tapes in fridge or outside in rain that you fair chance of getting things wrong. If you keep tapes all the time in library - most of the times this works, but generally people export their tapes out and then you have conditions of transport, conditions of place where you keep them... all those are important. I know it sounds terrible, but in reality it is much better and most likely you won't have problems. 2) Can I verify that the tape is read? How? You do scanner, you do cloning, you can do recover -n, you can do few things obviously and all of them are good candidates for verification.

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reliability of information storage on tape

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