This command scans every SCSI disk (/dev/sd*) to see if
it's a member of the array with the UUID
84788b68:1bb79088:9a73ebcc:2ab430da and then starts the array, assuming
it found each component device.
mdadm will
produce a lot of output each time it tries to scan a device that does
not exist. You can safely ignore such warnings.
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