Right, that's my problem. a drive is unplugged... while the system is not running mdadm will not reassemble the array on boot. Red Hat Bugzilla – Bug 1451660 Write that Fixed In Version:dracut-033-546.el7 I have drucat version 033-554.el7 and this bag don't fixed! >I believe you are hitting this bug: > > https://bugzilla.redhat.com/show_bug.cgi?id=1451660 > >That is, if a drive is unplugged while the system is not running, mdadm will not reassemble the array on boot. > >If a drive fails while the system is running, mdadm should fail it out of the array and the system will boot properly. > >Hoping for a fix in the next minor release.