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Bug#474747: mdcfg: Avoid sync fresh created arrays

Andrey Melnikov <temnota@kmv.ru> writes:

> Please, add mdadm '--assume-clean' options when creating new arrays
> in installer to avoid initial resync. This make huge speedups when
> creating big arrays (100 Gb or more).

While I sympathize, I feel like it isn't the best solution.  You will
get a huge mismatch_cnt and lose an initial check of your disks.
Isn't is possible/enough to tune /proc/sys/dev/raid/speed_limit_max
down for the time of the install?

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