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Reading the list of all disks in a *degraded* MD array

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It just so happens that a disk failed in my RAID-1 software array in Linux. cat /proc/mdstat displays only active partition:

Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10] 
md0 : active raid1 sdb1[1]

mdadm -v --detail --scan also lists only active disks/partitions.

/etc/mdadm/mdadm.conf doesn't seem to contain information on nominal disks/partitions contained in the array either.

So how can I read the list of disks an array should contain when array is degraded? I mean, when kernel reassembles the array at boot it has to take this information from somewhere?

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