Today I discoverd a problem with my Software-Raid. The Raid-Array stopped rebuilding with resync=PENDING.
cat /proc/mdadm: md0 : active (auto-read-only) raid1 sda1 sdb1 8387572 blocks super 1.2 [2/2] [UU] resync=PENDING
I have no idea how this raid became like this, but i solved it with the following command:
mdadm --readwrite /dev/md0
After that it started rebuilding:
md0 : active raid1 sda1 sdb1 8387572 blocks super 1.2 [2/2] [UU] [===================>.] resync = 98.3% (8245632/8387572) finish=0.0min speed=76454K/sec