Tony Sceats <tony.sce...@gmail.com> writes:
>> Slower, though ... is a bit of a strange claim. Not because it is false,
>> but because the answer is complex: you can, for example, double read speed
>> and halve write speed, using a two disk RAID 1 array ... in the ideal case.
>
> I must say I'm curious about this, because I have always assumed that for a
> RAID 1 the write speed would be roughly the same as a single disk, not
> halved..
Sorry, you are quite right. It should write at approximately the speed of a
single disk, and read at twice the speed. More or less. I shouldn't post
while I have a cold, because it makes my thinking bits not working.
[...]
> If this is true, I guess the reason would be that the same data travels over
> the same bus twice before the operation can be said to be completed,
> therefore halving your write speed.
This is the only point it actually cuts speed below a single disk, and that
takes more than two disks even on some of the less good modern systems.
Sorry.
Daniel
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