Hi! Why having LSR's chunk size 2^n limitation?

   I had experience of using FreeBSD's vinum (another software RAID).
Its author, Greg Lehey, stated in vinum's manual: "... A good
guideline for stripe size is between 256 kB and 512 kB.  Avoid powers
of 2, however: they tend to cause all superblocks to be placed on the
first subdisk. ..."

   Meanwhile, with LSR we're given exactly 2^n choices, for e. g.,
neither 768 KiB, nor 387 KiB won't go: "mdadm: invalid chunk/rounding
value: 387".

   So, why... ($Subj) and how complex would it be to abolish this
restriction? I think this could be a key to performance increase.

   P. S. Thanks a ton for LSR, Neil, BTW. :-)

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