I have observed that:
If md array is created with partitioned disk, the state change with array
degrade is working as expected.
Verified with kernel 4.2.0-23-generic
1. Create md array with partitioned disk
# mdadm --detail /dev/md500
/dev/md500:
Version : 1.2
Creation Time : Mon Feb 15 16:17:59
** Package changed: ubuntu-release-upgrader (Ubuntu) => mdadm (Ubuntu)
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https://bugs.launchpad.net/bugs/1543003
Title:
Mdadm –detail command is not displaying the state of a degraded
