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Re: [linux-lvm] offtopic but ...




-- Benjamin Scott <bscott ntisys com>


  Offline backups are for disaster recovery, not availability.  I think
you're trying to say that, but the point is getting confused.  The
difference between a small office's and a large bank's disaster recovery
plans is the difference between their definitions of "disaster".  A small
office probably considers a hard drive failure or OS corruption a
"disaster".  A bank thinks more along the lines of "multiple terrorist
attacks".

Actually they are more concerned about data corruption and audits. The hardend offline facilities are about being able to compare known data to what's online or meet gov't requirements for audit background. Their rule for designing systems is that any one box can get nuked without bringing the whole thing down.

This is why I've gotten into the habit of differentiating
archival storage from backup systems. In most warehousing
systems people mean "redundant" when they say "backup" (e.g.,
"a backup power system") and "archival" or "offline" for
slow storage used to recover from data failures.

Aside: most places have plenty of ways to deal with hardware
failure. Unless they hire consultants, most never even think
about how they'll handle data corruption. Hmmm... how about
"You're not paranoid, the boxes ARE out to get you" as a
slogan?

--
Steven Lembark                               2930 W. Palmer
Workhorse Computing                       Chicago, IL 60647
                                           +1 800 762 1582



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