Richard Scobie wrote:

Jon Nelson wrote:

quoted

My own tests on identical hardware (same mobo, disks, partitions,
everything) and same software, with the only difference being how
mdadm is invoked (the only changes here being level and possibly
layout) show that raid0 is about 15% faster on reads than the very
fast raid10, f2 layout. raid10,f2 is approx. 50% of the write speed of
raid0.

This more or less matches my testing.

Have you tested a stacked RAID 10 made up of 2 drive RAID1 arrays, 
striped together into a RAID0.

That is not raid10, that's raid1+0. See man md.

I have found this configuration to offer very good performance, at the 
cost of slightly more complexity.

It does, raid0 can be striped over many configurations, raid[156] being 
most common.

-- 
Bill Davidsen [off-list ref]
  "Woe unto the statesman who makes war without a reason that will still
  be valid when the war is over..." Otto von Bismark