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Re: [K12OSN] RAID in general ... was ... Software RAID... long messages



Julius Szelagiewicz wrote:

Jonathan,
	the point you make is debatable. There are RAID systems that deal
rather well with data corruption - all this redundand parity info is good
for much more than recovery from disk failure. a good, fast controller can
warn you about drive problems as it delivers *clean* data. julius

On Fri, 6 Dec 2002, Jonathan Bartlett wrote:

Also note that RAID does not shield you from data _corruption_ only
complete drive _failure_.


I would tend to agree with Jonathan, Julez.. unless, of course, you have a RAID controller that's sending bad data..


If the server craps on your RAID Array, you are a gonner. If a user deletes a file, it is gone. RAID isn't designed to protect against this.


RAID protects against physical *drive failure*.


The Operating System is supposed to act in a 'clean' fashion when maintaining filesystems.

Users are not supposed to delete critical files.

PowerSupplies are not supposed to let the smoke out

Motherboards are not supposed to have screws dropped in the case

... and on it goes. RAID is *one* tool in the "Server Insurance" game.

The importance of "Good Backups" has been drummed into all of us, but these days, considering the sheer volume of data to backup, it's getting rather difficult to do so.

A simple RAID - Mirror is good insurance, or RAID 5+1 if you have some serious loot to spend, and some serious uptime to maintain, but there is not really much point going to this effort and expenditure, unless you also have multiple redundant 'everything else' as well... a truly H/A system.



regards,
Steve








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