If I understand RAID, linux doesnt know about you having raid, or does it? Dont you build RAID 0,1,5 on the controller itself?
In the case of hardware RAID, yes, the controller has knowledge of the
RAID levels and manages the same. What it presents to Linux at that point
is a single LUN (logical unit number), which looks like a single disk
drive (though it could be data protected and/or set up for higher perform-
ance through striping and such by way of the hardware RAID controller).
Linux doesn't see this but it does invisibly benefit from it.
In the case of software RAID, Linux can do this too. See the RedHat manuals on this issue.
Linux software RAID can also use previously set up multiple hardware RAID
LUNs in a more complex software RAID setup if it is desired.
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