RAID HDDs spin up sequence

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Hi all,

assuming there is a NAS, with, for example, 10 HDDs
in RAID-6. Assuming the HDDs are put in standby, in
order to save energy, when the NAS is not used.
How is the spin up sequence when the corresponding
/dev/mdX device is accessed?
Will the system spin up one HDD at time or all together?

Obviously, one at time will limit the peak current,
thus allowing a better dimensioned PSU, working almost
always around the optimal efficiency point.

Thanks a lot for any information on the topic,

bye,

-- 

piergiorgio
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