Shrink mdadm RAID5 from 6 disks to 5?

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Does mdadm 3.1.x not support shrinking the number of disks in a RAID5 array?

I have successfully converted my 6x1.5tb RAID6 array to a 6x1.5tb
RAID5 array.  The issue that I now face is that one of those 6 drives
is failed / removed, and as a result - the new RAID5 array is down
it's parity drive.

I knew I was short a disk when I started the process, but I was under
the assumption that mdadm now supported shrinking of RAID5/6 arrays.
Am I mistaken, or can anyone throw some suggestions at me so I can
give it a try?

Thanks,

- Keith
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