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X ` Man[_3_]

On 11/20/11 11:16 AM, wrote:
On Sun, 20 Nov 2011 10:55:38 -0500, X ` Man
wrote:

That sounds like RAID 5. You don't really have a backup drive, the
data is striped across all four but you end up with one drive's worth
of overhead.

It is indeed a form of Raid 5. It allows me to have one of the four
drives go teats-up and be replaced without losing data. At least, that's
my understanding of what it is.

Yes that is how it works, as long as you only have one bad drive.
Generally one drive can support up to 11 in an array as I recall.
There is a scheme where you can have 11 supported by 2 drives and you
can lose 2. That was what the RAMAC used.

I just happen to have a fifth 2 terabyte hard drive sitting in its
sealed case on a shelf, just in case one of the drives in the Synology
server goes teats up.