On Fri, Jul 14 2017, NeilBrown wrote: > > Now create the linear from /dev/md2 and /dev/md3(?). Be sure to use > "-e 1.0 --data-offset=0". This creates /dev/md4 I meant to add: if you want the linear device to align with raid10 stripes (which seems elegant, and might slightly help performance is rare cases) you can use the "--rounding" mdadm option. e.g. mdadm --create /dev/md4 -l linear --rounding=1M -e 1.0 --data-offset=0 ..... NeilBrown
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