On Wed, Jul 19 2017, Ram Ramesh wrote: > Here is my attempt to repeat the steps in my last attempt to remove, > repartition, re-add. Last time I did it on /dev/sdb. Now I am going to > do it on /dev/sdc. Note that I have not been successful as you see at > the end. I am going to keep the array degraded so that I can still get > old info from /dev/sdc1, if you need anything else. I will keep it this > way till tomorrow and then add the device for md to rebuild. Please ask > anything else before that or send me a note to keep the array degraded > so that you can examine /dev/sdc1 more. Thanks. I *love* getting all the details. You cannot send too many details! This: > <good device still in md0> >> zym [rramesh] 265 > sudo mdadm --examine /dev/sdb1 >> /dev/sdb1: .. >> Avail Dev Size : 6442188800 (3071.88 GiB 3298.40 GB) and this: > <device just removed and repartitioned> >> zym [rramesh] 267 > sudo mdadm --examine /dev/sdc1 >> /dev/sdc1: ... >> Avail Dev Size : 11720780943 (5588.90 GiB 6001.04 GB) Shows the key difference. "Avail Dev Size", aka sb->data_size, is wrong. We can fix it. > > <Cannot re-add!!!!> >> zym [rramesh] 270 > sudo mdadm /dev/md0 --re-add /dev/sdc1 >> mdadm: --re-add for /dev/sdc1 to /dev/md0 is not possible Please try sudo mdadm /dev/md0 --re-add /dev/sdc1 --update=devicesize Thanks, NeilBrown
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