On Thu, Feb 16, 2006 at 10:53:46PM -0800, Craig Barratt wrote:

> The biggest issue is maintaining accurate reference counts so you
> know when to delete unused pool files.  The hardlink structure is
> using the file system to maintain reference counts.
> 
> There has been some consideration of using an RDBMS to maintain
> the reference counts, but no benchmarking has been done.  The
> table sizes will grow to be very large, and it's hard to imagine
> that any less disk seeks will be needed by the RDBMS since it
> certainly won't fit in memory.
> 
> But the concept is worthy of further consideration.

You might look at Bacula which stores similar information in an RDBMS.  One
possible advantage is that the database can be stored on a different
drive than the backup pool.

I would guess with proper indexes performance could be made adequate.

Dave


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