Alan Cox wrote:
Ar Maw, 2006-10-31 am 21:22 -0800, ysgrifennodd Linus Torvalds:
(We had the same issue with "PCI IDE controller". Some PCI IDE controllers
are clearly exactly that from a programming interface standpoint, but
because they support RAID in hardware, they claim to be RAID controllers,
since that is more "glamorous". Gaah ;^).
Actually its far uglier than that. With one exception they don't support
hardware raid mode, they use the RAID class tag to stop other OS drivers
grabbing the interface or seeing it directly as un-raided software raid.
Note that a lot of the software raid controllers actually have full
hardware RAID acceleration in the chipset (single block command is automatically
remapped across several drives of a RAID 0/1/10 configuration, reducing bus
transactions and bandwidth requirements.
But they still require a driver do perform the RAID management,
and are thus not true "hardware" RAID. But they are higher on the
food chain than total "pretend" RAID devices.
Cheers
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