While trying to diagnose the high backuppc data volumes issue posted to
the mailing list on June 14th, I had excluded a directory structure
containing about 140MB of data. I removed the exclude once Craig had
provided a fix for File::RsyncP and noticed that backup volumes jumped by
about 150MB. Tracing suggested that all the files in the previously
excluded directory structure were being backed up on every incremental
backup, even though the content of the files was unchanged (the first
incremental backup after the directory was added indicated that backuppc
had found the file in the backup pool).
Although the contents of the files had not changed, I had 'touch'ed the
files during the period where the directory structure has been excluded
so that Google Sitemap would index them . It seems that the backuppc
incremental backup got confused and repeatedly selected the files for
backup even though the file date was no longer changing.
File::RsyncP/rsync should have determined that the contents of the files
were identical to the pool copy. Verbose logging suggests that checksums
were exchanged, but rsync did nothing with them (the remote system
reported false_alarms=0 hash_hits=0 matches=0). The reason is not clear.
I had enabled checksum caching at one point but disabling checksum caching
it did not change the symptoms.
The problem was 'fixed' by doing a full backup. It appears that this
caused rsync to properly compare checksums and backuppc updated the file
date - the next incremental backup did not check the files that previously
had been copied in full. I 'touch'ed one of the files and verified that
the next incremental backup checked the file but rsync found no changed
blocks.--
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