Description of problem: mdadm-3.2.4 introduced a bug where --add can fail in common situations. The following upstream fix is needed: http://neil.brown.name/git?p=mdadm;a=commitdiff;h=d9751e06a601b5576b1b9e2c8126584083110ca5
mdadm-3.2.4-3.fc17 has been submitted as an update for Fedora 17. https://admin.fedoraproject.org/updates/mdadm-3.2.4-3.fc17
mdadm-3.2.5-1.fc17 has been submitted as an update for Fedora 17. https://admin.fedoraproject.org/updates/mdadm-3.2.5-1.fc17
Package mdadm-3.2.5-1.fc17: * should fix your issue, * was pushed to the Fedora 17 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing mdadm-3.2.5-1.fc17' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2012-8988/mdadm-3.2.5-1.fc17 then log in and leave karma (feedback).
mdadm-3.2.5-3.fc17 has been submitted as an update for Fedora 17. https://admin.fedoraproject.org/updates/mdadm-3.2.5-3.fc17
mdadm-3.2.5-3.fc17 has been pushed to the Fedora 17 stable repository. If problems still persist, please make note of it in this bug report.