cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
md127 : active (auto-read-only) raid10 sdc1[0] sdb1[2]
      1953382400 blocks super 1.2 512K chunks 2 far-copies [2/1] [U_]
          resync=PENDING
      bitmap: 15/15 pages [60KB], 65536KB chunk
 

Solution force repair/resync:

echo "repair" > /sys/block/md127/md/sync_action
 

mdadm, resync, pending, proc, mdstat, personalities, linear, multipath, raid, md, active, auto, sdc, sdb, chunks, copies, u_, bitmap, kb, chunk, repair, echo, quot, sys, sync_action,

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