As per suggestion on #ubuntu-server, I tried removing /dev/sdc3, "dd if=/dev/zero of=/dev/sdc3 bs=1M", and then readding it to see if that would kick off a sync, but it didn't make a difference.
Going to try replacing with a totally different hard drive here shortly, just to verify that isn't the issue.
As per suggestion on #ubuntu-server, I tried removing /dev/sdc3, "dd if=/dev/zero of=/dev/sdc3 bs=1M", and then readding it to see if that would kick off a sync, but it didn't make a difference.
Going to try replacing with a totally different hard drive here shortly, just to verify that isn't the issue.