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
