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Re: [K12OSN] why RAID?

Does anyone mind if this little discussion gets wikified? Reading along here I learned a great deal. It should be captured and worked into a location that we can all use. Any opposition? I'll take silence as agreement ;^)


Michael Wescott wrote:
why is it so important to get RAID set up?  Why not just
have a cron job that makes a copy of /home or any other
important directories?

RAID levels 1 and 5 provide a sufficient redundancy that you
can lose a disk without losing data. There are, of course,
other tradeoffs; the redundancy comes at the price of additional
disks and a performance impact on writes. There is also a gain in
read performance.

But disk failures aren't the only way to lose data. A RAID
decreases the probability that a hardware failure will cause
data loss, but it has no impact on users or administrators
deleting or overwriting a file. So having a RAID setup does
not eliminate the need for doing periodic backups.

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