Linux SoftRAID: "resync=PENDING"

[^rooker]

[PROBLEM]
I re-created Linux software RAID partitions md1 & md2, using "mdadm --create ...".
Everything went as it should, but looking at "/proc/mdstat" returned a PENDING synchronization state:

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$ cat /proc/mdstat

Personalities : [raid1]
md2 : active (auto-read-only) raid1 sdb4[1] sda4[0]
1828506496 blocks super 1.2 [2/2] [UU]
resync=PENDING

md1 : active (auto-read-only) raid1 sdb3[1] sda3[0]
104791936 blocks super 1.2 [2/2] [UU]
resync=PENDING

md0 : active raid1 sda2[0] sdb2[1]
19514240 blocks super 1.2 [2/2] [UU]

NOTE: One RAID1 wasn't touched: md0. Therefore there's no resync necessary.

[SOLUTION]
Convincing the Kernel software RAID to start the resync can be done with this command:

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$ mdadm --readwrite /dev/mdN

(Replace the N in "mdN" with your RAID device index)