Carlos E. R. wrote:
On 2014-07-09 22:44, Greg Freemyer wrote:
On Wed, Jul 9, 2014 at 2:42 PM, Carlos E. R.
To understand this we have to dig into some mathematical theory, so forget about reads and writes for a second and just focus on the math.
:-} !
== Beware: math below ==
Ok...
My maths are rusty, but I understand.
==== Alright time to talk about disks.
...
The end result is 2 simultaneous reads (P and D2) followed by 2 simultaneous writes (Pn and D2n).
I see...
The cool part about that is works regardless of how many disks are in the raid 5 array. A single data stride update always requires exactly 2 reads and 2 writes.
I thought that in the Linux raid 5, there is not a fixed or dedicated parity disk, but that a stride may be in one disk, the next on another. That should distribute the load, and not force to always read write to the P disk, on all ops.
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