I installed 2 new data servers with a big (12TB) RAID6 mdraid.
I formated the whole arrays with bad blocks checks. One server is moderately used (nfs on one md), while the other not.
One week later, after the raid-check from cron, I get on both servers
a few block_mismatch… 1976162368 on the used one and a tiny bit less
on the other…