I have a RAID-1 (mirrored) array set up on two identical devices, /dev/sdb and /dev/sdc. My procedure is documented here. Say I have a test file written to /dev/md0, Stuff.txt, that contains evidence of a vast government-alien conspiracy (something I'd naturally want to hang on to). Is there a command-line way to verify the presence of this file on each of these two devices?

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