If you only have 2 drives there's not much you can do to avoid concurrent
access. The killer is head seek time - if you have your only 2 drives
tied together in any kind of raid and the head needs to be in 2 places at
once it doesn't matter much how you laid out the partitions. Reads can be
sort-of independent on raid1 but writes make both seek to the same place.
That's not what I was referring to. I meant, for example, that if you have
on the same disks a RAID-0 containing data that is very frequently used and
a RAID-1 containing data that is rarelly accessed, then you still beneffit
from the qualities of both RAID types despite them being on the same
physical disks.
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