[BackupPC-users] High Backup Data Volumes After Re-adding an Excluded Directory
2010-07-18 10:32:34
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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