Tino Schwarze wrote at about 11:13:27 +0100 on Thursday, October 30, 2008:
 > Hi Jeffrey,
 > 
 > On Thu, Oct 30, 2008 at 03:55:16AM -0400, Jeffrey J. Kosowsky wrote:
 > 
 > > I have found a number of files in my pool that have the same checksum
 > > (other than a trailing _0 or _1) and also the SAME CONTENT. Each copy
 > > has a few links to it by the way.
 > 
 > That's intentional - what are the link counts for the files? 
 > If you look at BackupPC's status page, there is a line like:
 > 
 > * Pool hashing gives 649 repeated files with longest chain 28, 
Ahhhhh.... I was wondering what that line meant... (for real :)
Mine says:
         Pool hashing gives 9676 repeated files with longest chain 4
HOWEVER: my config has:
         $Conf{HardLinkMax} = 31999
And when I look at some of the "repeated" pool files, I see that they
only have 2-3 links each.

 > 
 > > Why is this happening? 
 > >   Isn't this against the whole theory of pooling.  It also doesn't seem
 > >   to get cleaned up by BackupPC_nightly since that has run several times
 > >   and the pool files are now several days old.
 > 
 > Because there is a file-system dependent limit to the number of hard
 > links a file may have. Look at $Conf{HardLinkMax} in config.pl.
 > 
 > Hm. I just took a look in my cpool and found some files which didn't
 > hit the hardlink count yet, but have a _0 and _1:
 > .../cpool/0/0 # ls -l c/00cd83be1ea3c1ffa3c6af2f4e310206* 
 > -rw-r----- 4371 backuppc users 34 2005-01-14 17:01 
 > c/00cd83be1ea3c1ffa3c6af2f4e310206 
 > -rw-r----- 3536 backuppc users 34 2005-03-02 02:22 
 > c/00cd83be1ea3c1ffa3c6af2f4e310206_0 
 > -rw-r-----  439 backuppc users 34 2006-03-11 02:04 
 > c/00cd83be1ea3c1ffa3c6af2f4e310206_1 
 > 
 > MD5Sums are not equal for all files, so maybe something got corrupted
 > (or I updated BackupPC during the time - the files are rather old!):
 > .../cpool/0/0 # md5sum c/00cd83be1ea3c1ffa3c6af2f4e310206*
 > 51ef559d1d7fa02c05fa032729c85804  c/00cd83be1ea3c1ffa3c6af2f4e310206
 > 51ef559d1d7fa02c05fa032729c85804  c/00cd83be1ea3c1ffa3c6af2f4e310206_0
 > 7e2276750fc478fa30142aa808df2a1f  c/00cd83be1ea3c1ffa3c6af2f4e310206_1
 > 
 > AFAIK, I started with $Conf{HardLinkMax} set to 32.000. As the files are
 > very old, a lot of links might have expired already.
 > 
 > I'm not sure though, how the file name is derived, I found another file
 > with same name but different MD5 sum:
 > .../cpool/0/0 # md5sum 8/0084734e7242df0fbc186ba6741d1bab*
 > db224998946bac7859f2448f41c58f88  8/0084734e7242df0fbc186ba6741d1bab
 > d1d8f3a86ae5492de0bf11f5cfb45860  8/0084734e7242df0fbc186ba6741d1bab_0
 > 
 > IIRC, BackupPC_nightly should perform chain cleaning.

Well, I haven't noticed any change after it runs...
I think I'm even more confused now ;)
How can I troubleshoot this further?

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