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BackupExec fails difference in file data

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6 replies

by meg hatrick

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Using Veritas Backup Exec 8.6 with HP SureStore DAT 24i (brand new), Adaptec AHA-2930CU card (also new), all new tapes. NT4 sp6 server.

Most of the time, verify after backup fails with "difference encountered in file data" in log file. One to several file names listed, depending on the day.

I've changed the max burst rate down from 20 to 10 on the controller - no effect. What else should I try?

6 replies

by lordinfidel

Personally, i've turned the verify function off.

I found that if a file is open or locked and bu exec goes to verify it, it can't and it will fail.

I found it more of an annoyance then anything else. If my users decide to keep a file open after hours and after I told them not to and it does not get backed up, then it's their own damn fault.

by meg hatrick

I would tend to agree with your sentiment. However, this particular NT server is not in production yet. We configured it recently, and I'm testing it before opening it up to the public ... which I don't want to do until I can get reliable backups. I have never had any problems with other NT & 2000 servers running Veritas. Thanks anyway. Any other ideas?

by lordinfidel

If you go to the support.veritas.com site and take a look at the following articles (in KB), they may shed some more light on this.

TechNote ID: 233990

TechNote ID: 245177

Basically the jist is, the verify operation is nothing more then just checking to make sure that the tape can be read.

If there is a speed issue with your controller to the drive, then this is a possible and most likely cause.

Even though I tuned my controller to the speeds that verits wanted, I still recieved those errors albeit less often.

But if you are going to use the verify function, you also need to use write checksums to media.

Also check out this technote and the related documents section at the bottom:
TechNote ID: 246958

by meg hatrick

Thanks for your comments. I've checked and double-checked, but no luck so far. I've disabled synch negotiation, turned the rate all the way down to 5, tried a different cable, and ran a diagnostic on the tape drive.

I ran Veritas with all compressions turned off, and also tried the NT backup ... same errors in both cases. I think I'm going to contact HP to see if the drive can be tested any further.

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