On 02/01/17 00:10, Paul Neuwirth wrote:
(Oh, and by the way, this exact sort of structure is one of the raid structures supported by mdraid, iirc.)
I think that depends on the raid level. hot spares in this meaning are useful on e.g. raid 10 systems where each disk has (at least) one exactly mirror. If there are three devices A,B,C,D and spare E with A=C, B=D - if one drive fails there is no redundancy for data anymore, so the hot spare gets involved and redundancy is recreated. No use for on RAID 0,1,5 or so.
I've been thinking about this since I made that last post. This is actually linux raid ten iirc. And please note that while "raid one plus zero" is often referred to as raid ten, they are actually very different beasts. Which is why, in true raid-10 arrays, you can have an ODD number of drives, NONE of which is an exact mirror of any of the others :-) While in raid-1+0 you need an even number of drives, minimum 4. Cheers, Wol -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org