At 09:28 PM 18/03/2008, you wrote:

>Right now database is accessed just a few times per day because I am
>testing another unrelated issues, but the automatic backup tasks are
>continously been executed.
>
>This morning one of the incremental backups failed. I got this message
>while executing nbackup:
>
>internal gds software consistency check (Duplicated item in allocation
>table detected)
>Failure: Database error
>[
>PROBLEM ON "attach database".
>SQLCODE:-902
>]
>
>The same error is shown in firebird.log at the same time:
>
>Database: /var/lib/firebird/data/test.fdb
>internal gds software consistency check (Duplicated item in allocation
>table detected)

This is just a wild question from the outfield (because I've never heard of this form of inconsistency before): are you storing/moving/copying files on/to/from FAT partitions or only native Linux partitions of matching format?

./heLen