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mdadmcontinued to say: "device or resource busy", but this made me try to feed him not with a fake block device, but with a "true" block device such as a loopback mounted image. At this point, I discovered that I had a stale/dev/loopthat was still using a file on the degraded array. I detached it and finallymdadmlet me stop the array. Horay! For everybody reading this, there is always a logical explanation formdadmbeing so jerk, so look for a stale process/file/mountpoint/nfs handler/open bash/loopback device/etc. still using the degraded array. :)