Jim Leonard wrote at about 17:17:24 -0500 on Monday, August 31, 2009:
 > Jeffrey J. Kosowsky wrote:
 > > But a program should not be dependent on volume management. Volume
 > > management is a general tool that can be helpful but should not be
 > > required. 
 > 
 > BackupPC isn't "dependent" on volume management more than any other 
 > program.  Volume management is simply one way to get around the 
 > limitations of storing more data than a single device will allow.  Do 
 > you think that expanding an SQL database would be different?

It would be *very* different since you can easily copy a SQL database to
another disk while due to the large number of hard-links, copying pool
data is not practical except at the block filesystem level. In fact,
rsync works very well with SQL databases.

 > 
 > Your reply is probably "but I can add more filesystems to work with the 
 > database method" -- but I can simply add more volumes to my existing 
 > filesystem.  It's the same operation in both cases, with the same 
 > complexity, yet in your scenario, now I need yet another component to 
 > maintain that can fail (a database).

You need to stop inventing straw men around arguments and
understandings that I don't have. This is the second posting in a row
where you have misread or misassumed something about what I have
rather clearly explained across way too many postings.

 >  > In fact, personally, I have never seen a non-enterprise
 > > piece of software that so clearly required it's own dedicated
 > > filesystem along with volume management. 
 > 
 > Then I would suggest you haven't seen enough software.  Backup systems 
 > are not trivial systems, and it should be implied that you would never 
 > set them up without consulting their operation and requirements.

OK since you are such a software expert, name 5 common pieces of
non-enterprise, user-space software that can't be backed up at the file
level and instead needs to be backed up at the block level (which
in turn pretty much implies the need for a dedicated filesystem for
that data only)?

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