RAID greater than 2TB on Fedora Core 3

[Robin Laing]

Jeff Vian wrote:
> On Mon, 2005-04-04 at 11:13 -0400, Scot L. Harris wrote:
> 
>>On Mon, 2005-04-04 at 10:45, Masopust Christian wrote:
>>

> 
> Your description is good, but slightly flawed in the raid5 description.
> 
> A raid5 configuration loses exactly one drive for available space no
> matter how many drives are involved.
> If the array contains 3 drives it loses 1/3 of the total drive space.
> If it instead contains 10 drives it only loses 1/10 the drive space.
> Thus the 20% figure is correct only in a case where the array contains 5
> physical drives.
> 
> This is because of the parity redundancy on raid5 that makes it possible
> to totally lose 1 drive and still lose no data.
> 
> The OP did not state how many physical drives he has in the array, so I
> cannot conjecture whether the usable space (2TB) is correct or not.
> 

And a 300GB drive doesn't have 300GB of available space once it is 
formatted.

-- 
Robin Laing