Philip,
Thanks for responding. Of course I meant 'Upgrade from Maverick to Natty
(problem didn't occur on Maverick)' :)
The array in question was created under Maverick ~~ like this:
mdadm --create /dev/md20 --level=6 --raid-devices=6 -c 128 -e 1.2 --name=SATAs
/dev/sd[cdefgh]
root@ubuntu:~# udevadm info --query=all --name=/dev/sdc
P: /devices/pci0000:00/0000:00:1f.2/host4/target4:0:0/4:0:0:0/block/sdc
E: UDEV_LOG=3
E: DEVPATH=/devices/pci0000:00/0000:00:1f.2/host4/target4:0:0/4:0:0:0/block/sdc
E: SUBSYSTEM=block
E: MAJOR=8
E: MINOR=32
E: DEVNAME=sdc
E: DEVTYPE=disk
there are no partitions on the disks.
AFAICT, the metadata is native mdadm's:
root@ubuntu:~# mdadm --detail /dev/md/SATAs
/dev/md/SATAs:
Version : 1.2
Creation Time : Tue Feb 22 23:50:59 2011
Raid Level : raid6
Array Size : 7814057472 (7452.07 GiB 8001.59 GB)
Used Dev Size : 1953514368 (1863.02 GiB 2000.40 GB)
Raid Devices : 6
Total Devices : 6
Persistence : Superblock is persistent
Update Time : Fri Mar 25 11:37:24 2011
State : clean
Active Devices : 6
Working Devices : 6
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 128K
Name : ubuntu:SATAs (local to host ubuntu)
UUID : ef584e09:52f1d802:3d7ec530:e2926701
Events : 34
Number Major Minor RaidDevice State
0 8 32 0 active sync /dev/sdc
1 8 48 1 active sync /dev/sdd
2 8 64 2 active sync /dev/sde
3 8 80 3 active sync /dev/sdf
4 8 96 4 active sync /dev/sdg
5 8 112 5 active sync /dev/sdh
root@ubuntu:~# mdadm --examine /dev/sdc
/dev/sdc:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : ef584e09:52f1d802:3d7ec530:e2926701
Name : ubuntu:SATAs (local to host ubuntu)
Creation Time : Tue Feb 22 23:50:59 2011
Raid Level : raid6
Raid Devices : 6
Avail Dev Size : 3907028896 (1863.02 GiB 2000.40 GB)
Array Size : 15628114944 (7452.07 GiB 8001.59 GB)
Used Dev Size : 3907028736 (1863.02 GiB 2000.40 GB)
Data Offset : 272 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 59f2e93e:39e5e899:5647c5cf:afe86dee
Update Time : Fri Mar 25 11:38:46 2011
Checksum : 1f749e5f - correct
Events : 34
Layout : left-symmetric
Chunk Size : 128K
Device Role : Active device 0
Array State : AAAAAA ('A' == active, '.' == missing)
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https://bugs.launchpad.net/bugs/742145
Title:
ddf1 format should be disabled in dmraid in favor of mdadm
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