On Thu, Jan 28, 2010 at 4:38 PM, Carlos E. R. <robin.listas@telefonica.net> wrote:
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On Thursday, 2010-01-28 at 09:12 +0100, Per Jessen wrote:
FYI, mdraid will do that too, no big deal. Isn't that the whole point? I think the primary difference between the two is that mdraid takes up CPU cycles doing the mirroring, dmraid does not.
Both do, AFAIK. Motherboard, bios raid, is not a real hardware raid, it needs a driver that does the real work in the cpu, with some help from the chipset. That's why it is called "fake raid".
- -- Cheers, Carlos E. R.
I don't know the specifics, but mdraid for sure and possibly dmraid have been getting updates in the last year or so to offload the parity logic. I assume that some raid cards now expose their xor engine and thus the data blocks can be sent to them to handle the xor logic. The patches I noticed were for IBM hardware iirc. I think the really big difference between dmraid and mdraid is compatibility. MS Windows only supports the equivalent of dmraid, so if you want to create a dual boot raid system, you need to go that way. If Windows is not a concern, I think mdraid is the obvious choice but there may be some subtleties I don't know about. Greg -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org