mdadm auto-read-only

If your array looks like this,

md1 : active (auto-read-only) raid10 sda2[0] sdd2[3] sdc2[2] sdb2[1]
        7810048 blocks super 1.2 512K chunks 2 near-copies [4/4]  [UUUU]

It’s very easily corrected by using mdadm to set the array as readwrite like this.

 mdadm --readwrite /dev/md1

This will cause the array to resync. You can check it’s status like this.

 cat /proc/mdstat


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