On 27/01/2021 04.11, David C. Rankin wrote:
On 1/26/21 6:37 AM, Carlos E. R. wrote:
On 26/01/2021 01.27, David C. Rankin wrote:
On 1/25/21 4:07 PM, Markus Egg wrote:
Hello, ...
If this is windows on motherboard raid, it's probably dmraid (otherwise known as Fake RAID or BIOS RAID) -- it's not really Fake, it's just the moniker dmraid ended up with from the hardware RAID snobs...
It is really fake, because it doesn't run in hardware: it runs in software, on the computer CPU, with read support on BIOS so that it can boot. Once booted it gets write code from the driver, running on the mainboard CPU, not on the raid chipset.
A true hardware raid doesn't use the mainboard CPU, and is transparent to the operating system.
I'm sure Neil Brown and the rest on the linux-raid list would be surprised to learn it is fake...
It's software... (and the overhead ceased being measurable when 486 came out)
Fake is far superior to hardware.
Of course it is :-)
Just have a battery die on your hardware card and drop from write-back to write-through... and then find out your battery was discontinued 3 years ago. Now you have a hardware specific RAID install that can no longer benefit from the hardware write-back performance at all... Though, unless you are saturating whatever your setup is -- it really doesn't matter.
You don't need selling me software raid - but I prefer true software raid. The disadvantage is you can not double boot to Windows. -- Cheers / Saludos, Carlos E. R. (from 15.2 x86_64 at Telcontar)