Hi Tom:

So, the failing ec code is also 10+2 here:

ceph osd erasure-code-profile set glasgow-ec \
   k=10 \
   m=2 \
   crush-failure-domain=osd

Test EC codes which have succeeded, so far are:

k=4, m=2 failure-domain=osd
k=4, m=2 failure-domain=host
k=8, m=2 failure-domain=osd

EC codes which have failed
k=6, m=2 failure-domain=osd
k=10, m=2 failure-domain=osd

It seems likely that jerasure ec pools (at least) are not compatible with 
libradosstriper if k is not a power of 2.

I suggest this be submitted as a bug?
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