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To RAID or not to RAID

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A nice, brief overview of the tradeoffs of RAID-1 (mirroring) and RAID-0 (anti-RAID, or 'Not-RAID' -- maybe that's what the title means :) and the various other, more complex RAID levels.
While the redundancy that is built into RAID definitely gives you some very important protection, it doesn't turn your PC into Superman (er... "SuperPC"). There are still sources of failure that can and do strike RAID systems. If you examine this list of risks to your data, one thing will become clear immediately: RAID not only doesn't protect against all of them, it doesn't even protect against most of them! RAID won't help you if a virus wipes out your system, or if a disgruntled employee decides to delete all your files, or if lightning hits your building and causes a fire in your computer room. And even in the area of hardware failure, RAID is not foolproof. There have been cases where more than one drive has failed at the same time, causing the entire array to fail and necessitating expensive data recovery. It's not common, but then, neither are lightning strikes. This is one reason why backups remain critical even when RAID is used.
 read more | mail this link | score:7147 | -Ray, May 29, 2002 (Updated: August 11, 2003)
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