Hi I appear to have been affected by the bug you found on 7/15/12. The data I have on this array is really important and I want to make sure I get this correct before I actually make changes.
Configuration:
md0 is a RAID 6 volume with 24 devices and 1 spare. It is working fine and was unaffected.
md1 is a RAID 6 volume with 19 devices and 1 spare. It was affected. All the drives show as unknown raid level and 0 devices. With the exception of device 5. It has all the information.
Here is the output from that drive:
serveradmin@hulk:/etc/mdadm$ sudo mdadm --examine /dev/sdaf
/dev/sdaf:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 6afb3306:144cec30:1b2d1a19:3a56f0d3
Name : hulk:1 (local to host hulk)
Creation Time : Wed Aug 15 16:25:30 2012
Raid Level : raid6
Raid Devices : 19
Avail Dev Size : 5860531120 (2794.52 GiB 3000.59 GB)
Array Size : 99629024416 (47506.82 GiB 51010.06 GB)
Used Dev Size : 5860530848 (2794.52 GiB 3000.59 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 205dfd9f:9be2b9ca:1f775974:fb1b742c
Update Time : Sat Sep 29 12:22:51 2012
Checksum : 9f164d8e - correct
Events : 38
Layout : left-symmetric
Chunk Size : 4K
Device Role : Active device 5
Array State : AAAAAAAAAAAAAAAAAAA ('A' == active, '.' == missing)
Now I also have md2 which is a striped RAID of both md0 and md1.
When I type:
sudo mdadm --create --assume-clean /dev/md1 --level=6 --chunk=4 --metadata=1.2 --raid-devices=19 /dev/sdaa /dev/sdab /dev/sdac /dev/sdad /dev/sdae /dev/sdaf /dev/sdag /dev/sdah /dev/sdai /dev/sdaj /dev/sdak /dev/sdal /dev/sdam /dev/sdan /dev/sdao /dev/sdap /dev/sdaq /dev/sdar /dev/sdas
the following error for each device.
mdadm: /dev/sdaa appears to be part of a raid array:
level=-unknown- devices=0 ctime=Wed Aug 15 16:25:30 2012
mdadm: partition table exists on /dev/sdaa but will be lost or
meaningless after creating array
I want to make sure by running this above command that I won't affect any of the data of md2 when I assemble that array after creating md1. Any help on this issue would be greatly appreciated. I would normally just DD copies but as you can see I would have to buy 19 more 3TB hard drives as well as the time to DD each drive. It is a production server and that kind of down time would really rather be avoided.
Thank you so much for your time.
Mark Munoz
623.523.3201--
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