> >>Don't think RAID is what he means. I think he means combining multiple
> >>block-devices in one. RAID is putting the SAME data on more then one
> device.
>
>
> >RAID level 0 is striping.
>
> >RAID level 1 is mirroring.
>
> >RAID levels 3, 4, and 5 are striping with parity.
>
> >RAID level 0 is often not referred to as RAID at all. I believe it's not
> >part of the "official" RAID definition, but if so it's certainly a defacto
> >definition.
>
> >There's also an option that I call "concatenation" (not sure what official
> >name is) where you write everything onto one disk until it's full, then go
> >on to the next one. It doesn't have a RAID name. RAID 0 would give you
> >better throughput, and acheive the same effect in terms of space.
>
> You're right on this. I don't know what RAID controllers cost, but it will
> be more than an IDE controller....
Actually, RAID 0 is part of the official definition, AFAIK. And
concatenation is the proper term for sequential write across disk in that
manner (as opposed to striping). Both RAID and virtual file system
concatenation are possible via software, although I'm unaware of any Linux
products that would provide either.
However, the "concatenation" you refer to is actually just a special
case of striping, in which the stripe is the same size as the entire
writable area of the disk.
--Mark
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