# Fedora 27 RAID Resync on every boot, reopened [closed]

I had thought that the answer suggested before would resove this problem: echo idle > /sys/block/md127/md/sync_action but it doesn't work. Re-reading the sync_action file after issuing this command shows it to still be set to "resync" and my workstation is still unresponsive. mdadm --detail shows "state: clean, resyncing" and my workstaion is still unusable for hours. This behaviour arrived with Fedora update version 27-18.100 or the previous one, within the last three weeks.

There is very little data (a few tens of Gb on a 6 Tb RAID 5 system) and it seems to checking the entire enpty disk.

Any ideas?

A mdadm RAID will always resync the whole disks, despite the usage of the disks. Did you consider that this could be a hardware problem and did check your disks with smartctl -a? Also look into dmesg and /var/log/messages for problems. For me it also seems uncommon that the workstation is "unusabe" during the resync. It will put load on the disks and the computer, but a resync should not render the whole workstation useless.