Re: RADI10 slower than SINGLE drive - tests with fio for block device (no filesystem in use) - 18.5k vs 26k iops

CoolCold [off-list ref] writes:

quoted

Write will be slower is normal, because each write to the array must
write to all the rdev and wait for these write be be done.

This contradicts with common wisdom and basically eliminates one of
the points of having striped setups - having N stripes, excepted to
give up to N/2 improvement in iops.

Striping is raid0.  Radi10 is striping, AND mirroring.  In the case of
only two drives in the default near layout, it is identical to raid1, so
you only have a single stripe.