Hi,
I am aware that for a very long time it was not possible to change
the number of devices in an mdadm RAID-10. But then recently I am
sure I saw threads here alluding to this being possible. e.g.:
http://marc.info/?l=linux-raid&m=140768923829685&w=2
I have a 6 device RAID-10 near=2 array that I would like to shrink
down to 4 devices.
I have compiled mdadm 3.3.2 and am using kernel 3.16.0.
$ sudo mdadm --detail /dev/md2
/dev/md2:
Version : 0.90
Creation Time : Sun Jun 4 08:18:58 2006
Raid Level : raid10
Array Size : 471859200 (450.00 GiB 483.18 GB)
Used Dev Size : 309363520 (295.03 GiB 316.79 GB)
Raid Devices : 6
Total Devices : 6
Preferred Minor : 2
Persistence : Superblock is persistent
Update Time : Sat Aug 23 15:23:38 2014
State : active
Active Devices : 6
Working Devices : 6
Failed Devices : 0
Spare Devices : 0
Layout : near=2
Chunk Size : 64K
UUID : 3905b303:ca604b72:be5949c4:ab051b7a
Events : 0.312149991
Number Major Minor RaidDevice State
0 8 51 0 active sync /dev/sdd3
1 8 67 1 active sync /dev/sde3
2 8 83 2 active sync /dev/sdf3
3 8 19 3 active sync /dev/sdb3
4 8 35 4 active sync /dev/sdc3
5 8 3 5 active sync /dev/sda3
$ sudo ./mdadm --grow -n4 /dev/md2 --backup-file /var/tmp/mdadm.backup
mdadm: Cannot set new_data_offset: RAID10 reshape not
supported on this kernel
Is that not yet possible, then?
(Each device is 320GB so it should all fit with only four of them)
Cheers,
Andy
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