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:
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
Fake is far superior to hardware. 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.