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

-- Tim <tim connectlive com>

Incremental backups are orthogonal to true high availability, but you're
guaranteed to have low availability if you have no disaster recovery
plans.  I wish there were a more succinct way to express that!

How about:

"Don't tempt Murphy."

"Lack of planning is a disaster in itself."

"0 to the 10th equals nothing at all"

(the last from Jethro Tull if you handn't seen it before).

But this depends on the environment. In a number of the data warehouses I've worked on there simply would not be time to restore the data from archival media. The best they can do is make the "high" approach 100% and live with it. There will be a relatively small set of archival storage that can be brought on line, but there is no way that restoring data from archival media is an acceptable recovery plan in these cases ("Sorry, General, we can't respond to that nuclear bomb comming in: it'll take us at least 3 more hours to recover from these tapes." Think banker, heavy industrial plant and you have the same situation).

The good news is that today's near-term storage hardware
(from fiber scsi cards down to the disks) will handle
anything short of a nuclear blast without failing miserably.
This leaves "full availability" systems as a viable alternative
in many cases.

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

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