Hi,After having been through a few ups and downs with md and mdadm I think it would be a good idea if mdadm had a safe mode for growing raid5.
Safe mode would entail several things: 1. It would kick off a resync.2. It would write to the spare drive to ensure it is ok. (we have to wait for the resync anyway)
3. It would make a backup file mandatory.4. It would only allow to grow the raid by one device. (because if more than one of the new drives go bad, we have a big problem)
I know it would probably result in a bit of a deviation of the usual mdadm behaviour but I think its worth it.
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