On Sun, 27 Sep 2015, Anton Aylward wrote:
On 09/27/2015 11:44 AM, Xen wrote:
It is not simply "a driver" :-)
That is pretty much irrelevant. Software Linux RAID does the same and I don't think there is really a great performance penalty. The issue is with these cards that (a) it requires a driver for the OS to even see the RAID as a RAID and (b) that it requires a driver to pretty much do anything.
There get to be a point where you go off on a misunderstanding.
No, once again you misunderstand ME. I mean exactly what you mean. "Seeing the RAID as a RAID" means seeing it as a transparent logical thing. Or not seeing it at all, but seeing one logical disk. That is the benefit of a hardware RAID card (or any raid card, as it should be) -- not really the CPU processing benefit. What I meant was that the "fake cards" require a driver to see the array of disks as one logical thing, without the driver the OS will just see it as independent logical disks, or physical disks. So "not seeing the RAID as a RAID" means seeing individual disks without array organisation.
You statement that it require a driver to see the RAID as RAID is irrelevant when it comes to hardware RAID. That's the whole point - the system is *NOT* supposed to be managing it!
Duh. That was my point exactly. Forgot your morning coffee? :P. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org