Subject: Re: RAID6 simply does not start as /dev/md8
From: Rudy Zijlstra <rudy@xxxxxxxxxxxxxxxxxxxxxxxxx>
To: Yann Ormanns <yann-ormanns@xxxxxx>
Date: 2011-04-08 16:36 (+0200)
> Do you have perhaps old raid metadata on the disks? Are you certain you
> have no raid metadata on the whole disks?
> you can check with mdadm --Examine /dev/sdc
>
> Cheers
>
>
> Rudy
>
To eliminate this possibility, I "zeroed" all six disks before I created
the array:
dd if=/dev/zero of=/dev/sda bs=1M
...
dd if=/dev/zero of=/dev/sdf bs=1M
Output of mdadm -E /dev/sda1:
/dev/sda1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 6286b922:2da22a6c:f8fba333:fc88f457
Name : Atlas:8 (local to host Atlas)
Creation Time : Fri Apr 8 00:58:12 2011
Raid Level : raid6
Raid Devices : 6
Avail Dev Size : 3907025072 (1863.01 GiB 2000.40 GB)
Array Size : 15628095488 (7452.06 GiB 8001.58 GB)
Used Dev Size : 3907023872 (1863.01 GiB 2000.40 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 1a016923:a408d8ee:d8f6625f:bcf55b66
Update Time : Fri Apr 8 09:53:13 2011
Checksum : 69969b9b - correct
Events : 19
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 0
Array State : AAAAAA ('A' == active, '.' == missing)
The complete output of mdadm -E /dev/sd[a,b,c,d,e,f]1 can be found here:
http://nopaste.info/658b72791c_nl.html
Best regards,
Yann
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