Mike,
> It is possible, albeit more unlikely, for a block device to have a non
> power-of-2 for chunk_sectors (e.g. 10+2 RAID6 with 128K chunk_sectors,
> which results in a full-stripe size of 1280K. This causes the RAID6's
> io_opt to be advertised as 1280K, and a stacked device _could_ then be
It is possible, albeit more unlikely, for a block device to have a non
power-of-2 for chunk_sectors (e.g. 10+2 RAID6 with 128K chunk_sectors,
which results in a full-stripe size of 1280K. This causes the RAID6's
io_opt to be advertised as 1280K, and a stacked device _could_ then be
made to use a bl