Matthias writes:

> Every day I get a message in __LOGDIR__/LOG:
> 2009-08-12 02:35:49 Cpool is 322.19GB, 1142028 files (860 repeated, 31 max 
> chain, 11424 max links), 4369 directories
> 
> What is the meaning of:
> repeated

The total number of pool files with hash collisions.  Since the hash is
not computed over the entire file contents, it's common to get files with
the same hash.

> max chain

The biggest set of pool files with the same hash.  This is a potential
performance bottleneck if the number gets too large, since a incoming
file needs to be matched against every pool file in the chain.  That
means each file is O(n), and n files from a full backup all with the
same hash takes O(n^2) comparisons.  So it's a problem when this number
gets too big.

> max links

The maximum number of hardlinks on any pool file.  The minimum is
2 (anything with 1 is deleted since it is no longer used).  This
means that across all your backups you have one file that appears
11424 times.

Craig

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