Migration from Non-RAID system to RAID5 may sometimes be not possible. There is a memory leak in mdadm which may stop the migration process. This occurs especially when large disks are used. There is a fix: http://neil.brown.name/git?p=mdadm;a=commitdiff;h=758be4f1c9cda8eefb2fd241835521462196e16c Originally reported by Maciej Patelczyk
mdadm-3.2.2-15.fc16 has been submitted as an update for Fedora 16. https://admin.fedoraproject.org/updates/mdadm-3.2.2-15.fc16
Package mdadm-3.2.2-15.fc16: * should fix your issue, * was pushed to the Fedora 16 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing mdadm-3.2.2-15.fc16' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2011-16299/mdadm-3.2.2-15.fc16 then log in and leave karma (feedback).
mdadm-3.2.2-15.fc16 has been pushed to the Fedora 16 stable repository. If problems still persist, please make note of it in this bug report.