Re: super slow reshape speed after power failure

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[ ... ]  reshape was running it was running around 4mb/s,
which is slow to begin with. [ ... resync too ... ]

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A bigger value for 'md/stripe-cache' might help, alleviating
some alignment issues, but usually it is not like 10 times
better, but might be still worthwhile even if it will be still
slow.

I tried values up to 32768, but no difference.

Then probably the partitions are really misaligned.

Anyhow a wev search for similar cases shows in some cases higher
reshape and resync rates, but not enormously higher, and usually
'stripe_cache' helps, at least with the reshape.

Perhaps disabling barriet might help if they are enabled, but
that would be quite dangerous, as you already had a crash during
reshape.

It may be good to reassemble the array with '--freeze-reshape'
to allow it to resync without interference from reshaping,
hopefully faster, and then '--continue' after resyning has
ended.