On Wednesday, November 06, 2013 10:06 AM Francis Moreau <francis.moro@xxxxxxxxx> wrote: > Hi Neil, > > So far now answer, I'm adding you in the thread since it seems a > critical issue, hope you don't mind. > > Thanks > > On Mon, Oct 28, 2013 at 7:18 AM, Francis Moreau <francis.moro@xxxxxxxxx> > wrote: > > Hi, > > > > > > [ Adding Dan Williams in CC since it appears to be the author of the > > intel fake raid support. ] > > > > > > On Wed, Oct 23, 2013 at 11:24 AM, Francis Moreau <francis.moro@xxxxxxxxx> > wrote: > >> Hello, > >> > >> I'm testing ISW fake-raid with mdadm 3.3 and I can't add back a disk > >> to a container previously marked as failed and removed. > >> > >> Also I'm testing ISW inside a VM so I'm not sure my test case is valid. > >> > >> So basically my ISW array was created with dmraid. I then installed my > >> system on this array and rebooted to switch to mdadm. So far so good > >> everything seems to work perfectly: > >> > >> # export IMSM_NO_PLATFORM=1 > >> > >> # cat /proc/mdstat > >> Personalities : [raid1] > >> md126 : active raid1 sda[1] sdb[0] > >> 2092375 blocks super external:/md127/0 [2/2] [UU] > >> > >> md127 : inactive sda[1](S) sdb[0](S) > >> 6306 blocks super external:imsm > >> > >> unused devices: <none> > >> > >> # mdadm -E /dev/sdb > >> /dev/sdb: > >> Magic : Intel Raid ISM Cfg Sig. > >> Version : 1.1.00 > >> Orig Family : ef92cdd9 > >> [ ... ] > >> > >> Now I'm marking sda as failed and remove it: > >> > >> # mdadm --fail /dev/md126 sda > >> # mdadm --remove /dev/md127 sda > >> > >> everything works fine until I add back sda to the container: > >> > >> # mdadm --add /dev/md127 /dev/sda > >> mdadm: add /dev/sda > >> > >> # cat /proc/mdstat > >> Personalities : [raid1] > >> md126 : active raid1 sdb[0] > >> 2092375 blocks super external:/md127/0 [2/1] [_U] > >> > >> md127 : inactive sda[1](S) sdb[0](S) > >> 6306 blocks super external:imsm > >> > >> sda is not added anymore to the array md126 and therefore no resynchro > happens. > >> > >> # mdadm -E /dev/sda > >> /dev/sda: > >> MBR Magic : aa55 > >> Partition[0] : 3612577 sectors at 2048 (type 83) > >> Partition[1] : 560133 sectors at 3616767 (type 05) > >> > >> Could anybody tell me if that's expected and if so could you englight me ? > >> Hi Francis, If you created a RAID array with mdadm, it would work correctly - recovery would start. The IMSM metadata is not supported in dmraid anymore and mdadm does not have to work correctly with array created and started with dmraid. Lukasz
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