Raid 5 (was: Mounting of Linux volumes)

Andrew McNabb amcnabb at mcnabbs.org
Thu Dec 1 22:55:02 MST 2005


On Thu, Dec 01, 2005 at 10:45:22PM -0700, Nicholas Leippe wrote:
> 
> Any application that relies on the coherency of multiple, volatile files--ie 
> they correlate differently over time.
> 
> - databases
> - any application that produces temporary files (web server session
>   data, perhaps?)
> 
> I'm sure there are others.
> 
> This is the reason point-in-time backup systems are so expensive--it's a
> very difficult problem to solve in a manner that is completely transparent
> to running processes.
> 

The DM system in Linux can do a snapshot (I believe LVM has an interface
to it).  It's a very simple approach.

-- 
Andrew McNabb
http://www.mcnabbs.org/andrew/
PGP Fingerprint: 8A17 B57C 6879 1863 DE55  8012 AB4D 6098 8826 6868
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