Hi,
i have 4disc RAID10 on my server and i am trying to grow it to 6 devices.
As direct grow of RAID10 is unavailable so I decided to do it this way:
RAID10->RAID0->Grow RAID0 to 3 devices->RAID0(3 devices)->RAID10(6devices)
But i have problem on the first step. I have degraded my RAID10 array:
# mdadm --detail /dev/md1
/dev/md1:
Version : 1.1
Creation Time : Mon Sep 2 12:09:53 2013
Raid Level : raid10
Array Size : 1023996928 (976.56 GiB 1048.57 GB)
Used Dev Size : 511998464 (488.28 GiB 524.29 GB)
Raid Devices : 4
Total Devices : 2
Persistence : Superblock is persistent
Update Time : Sat Mar 22 13:00:25 2014
State : clean, degraded
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Layout : near=2
Chunk Size : 512K
Number Major Minor RaidDevice State
0 0 0 0 removed
1 8 17 1 active sync /dev/sdb1
2 0 0 2 removed
4 8 49 3 active sync /dev/sdd1
And want to change it to RAID0:
# mdadm /dev/md1 --grow --level=0
or:
# mdadm /dev/md1 --grow --raid-devices=2 --level=0
but the result is always the same:
mdadm: /dev/md1: could not set level to raid0
dmesg shows:
md/raid0:md1: All mirrors must be already degraded!
md: md1: raid0 would not accept array
But the array is already degraded... What am I doing wrong ?
I am using Centos 6.5 default version of kernel and mdadm.
PS: I know that it is possible to grow RAID10 by creating new array with
3 drives and 3 missing and then move data between them, but i am trying
to grow live system without any offline time.
Regards,
Marcin Wanat
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