On 07/19/2017 06:14 PM, NeilBrown wrote:
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
Neil,
Thanks a ton. That does it. It got re-added without any issue. It is
rebuilding because the array was used to record two TV programs when it
was in degraded state. But the re-add is accepted.
zym [rramesh] 274 > sudo mdadm /dev/md0 --re-add /dev/sdc1
--update=devicesize
Size was 11720780943
Size is 6442188800
mdadm: re-added /dev/sdc1
zym [rramesh] 275 > cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5]
[raid4] [raid10]
md0 : active raid6 sdc1[10] sdb1[6] sdg1[11] sdd1[12] sdf1[8] sde1[9]
12348030976 blocks super 1.2 level 6, 64k chunk, algorithm 2
[6/5] [UU_UUU]
[========>............] recovery = 42.6%
(1316769920/3087007744) finish=292.2min speed=100952K/sec
bitmap: 2/23 pages [8KB], 65536KB chunk
unused devices: <none>
Wol,
If you read this, this may worth a mention on wiki page.
Ramesh
--
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
