Re: Backup verify problems

DJ wrote:
On Jan 30, 3:26 pm, gsdguy <peter...@xxxxxxxxxxxxxxxxxxx> wrote:
I am getting backup verify errors and I don’t know why. I hope someone
can explain what is happening.

I had a disk and tape drive failure and restore the disk from a backup
tape ( I bought a new DAT tape drive). I decided to start using the /
verify switch when I do backups. When I did my first backup to tape
with /verify I got verify errors like the ones shown below.

%BACKUP-E-VERIFYERR, verification error for block 31 of DUA2:[LEROY]
MAIL.MAI;1
%BACKUP-E-VERIFYERR, verification error for block 32 of DUA2:[LEROY]
MAIL.MAI;1
%BACKUP-E-VERIFYERR, verification error for block 33 of DUA2:[LEROY]
MAIL.MAI;1
%BACKUP-E-VERIFYERR, verification error for block 34 of DUA2:[LEROY]
MAIL.MAI;1
%BACKUP-E-VERIFYERR, verification error for block 35 of DUA2:[LEROY]
MAIL.MAI;1
%BACKUP-E-VERIFYERR, verification error for block 36 of DUA2:[LEROY]
MAIL.MAI;1

I created a disk backup saveset and got the same verify errors. I
checked the error log for any hardware errors and there were no
errors. I then restored one of the files that had verify errors to
another disk and did a difference between the original file and the
restored file. The difference program said that there was no
difference between the two files. I also did an analyze/disk on the
disk drive and there are not errors.

Can someone explain what is going on? How can I get rid of these
verify errors? Thank you.

Dear GSDGUY:

Backing and verifying on any volatile file will cause this problem. At
time = 0, you backup the email file, then at time = 2 hours you are
verifying what you back up onto tape. However, during this time
“Leroy” has deleted some email messages, thus causing the backup
verification error to occur. The information store in the mail.mai
file has been deleted.

Regards,
Daryl Jones

If you can't, somehow, quiesce the system, or at least the disk, while you make your backup, you may not be able to restore everything in usable form!

Databases, e.g. Oracle, can sometimes make a "snapshot" of a filesystem that allows you to get a consistent backup. Lacking such a feature, your choices are to take the disk offline or to live with the possibility that something will be lost if you have to do a restore.
.

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