On Sat, 22 Mar 2014 12:07:50 +0100 Marcin Wanat <mwanat@xxxxxxxxx> wrote: > 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: It is available with latest kernel and mdadm... > > 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 don't think it is you. What does /sys/block/md1/md/degraded contain? If it isn't '2', then that is the problem. Maybe if you stop the array the array and assemble it again it could get that right. > > I am using Centos 6.5 default version of kernel and mdadm. uname -a ; mdadm -V is more helpful. NeilBrown > > > 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 > -- > 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
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