Re: Kernel 2.6.17 and RAID5 Grow Problem (critical section backup)

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Hm, what's superblock 0.91? It is not mentioned in mdadm.8.

Not sure, the block version perhaps?

Well yes of course, but what characteristics? The manual only lists
 0, 0.90, default
 1, 1.0, 1.1, 1.2
No 0.91 :(

AFAICR superblock version gets raised by 0.01 for the duration of reshape, so that non-reshape aware kernels do not try to assemble it (and cause data corruption).

Petr