[DRBD-user] drbdadm verify always report oos

[d tbsky]

hi:
    I am using drbd 8.4.7 which comes from epel under scientific linux
7.2.  when I try "drbdadm verify res", it report there is oos.

   so I disconnect/connect the resource, the oos now becomes 0. but
when I verify it again, it report oos again.  the oos amount is
different than previous, but the oos sector numbers are simliar.

   I also try "invalidate-remote" to resync all and then verify, but
it still report oos.

    I don't know what happened, it seems my cluster has big problems
with data consistency. but all the vm running above the drbd resources
seems fine, and I migrate them between hosts many times.

   is the behavior normal or I should replace the hardware now?

   thanks for help!!