Mickael Marchand wrote:
so basically I don't really know what to do with my sdf3 at the moment and fear to reboot again :o) maybe a --re-add /dev/sdf3 could work here ? but will it survive a reboot ?
At this point, for whatever reason, your kernel doesn't see /dev/sdf3 as part of the array.
You could mdadm --add it, and yes, it should survive a reboot. Unless something is seriously goofy, of course, but that's impossible to determine from your trouble report.
A RAID-6 in two-disk degraded mode often ends up needing two recovery passes (one to go from 2->1 and one from 1->0). This isn't a technical need, but is a result of the fact that unless you happen to have two hotspares standing by, the 2->1 recovery typically will have started by the time second disk is added. This may be the source of your strangeness.
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