Re: Raid 5 Problem

[nterry <nigel@nigelterry.net>]

Neil Brown wrote:
> On Sunday December 14, nigel@nigelterry.net wrote:
>   
>> I added the DEVICE /dev/sd[bcde]1 to mdadm.conf and that apepars to have 
>> fixed the problem.  2 reboots and it worked both times.
>>     
>
> An alternate fix in this case would be
>
>   mdadm --zero-superblock /dev/sdb
>
> to remove the old superblock that is confusing things.
>
> NeilBrown
>
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>   
That fails as:

[root@homepc ~]# mdadm --zero-superblock /dev/sdb
mdadm: Couldn't open /dev/sdb for write - not zeroing
[root@homepc ~]#

I also discovered that /dev/sdc appears to have a superblock which maybe 
explains why # mdadm --examine --scan throws up three arrays.  Trying to 
zero the superblock on /dev/sdc gives the same error.