Saturday night we were alerted to high load on various mongo-prod-boxes.
I ssh-ed into the machine and found a few processes that I was unfamiliar with consuming about 10% cpu.
They were md0_raid10 and md0_resync .
Googled around a bit.... seems to be something to do with the RAID array configured for us.
Used tooling to run "sudo mdadm -D /dev/md0" across various machines and found a good chunk of them with "Check Status : 93% complete" or similar percentages.
Seems that some event happened cuz these all flaked about the same time.
still not sure what the root was.....
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