[CentOS] [SOLVED] more software raid questions

Nataraj incoming-centos at rjl.com
Sun Oct 24 01:05:30 EDT 2010


fred smith wrote:
> On Thu, Oct 21, 2010 at 11:03:27AM -0700, Nataraj wrote:
>   
>> fred smith wrote:
>>     
>>> Thanks for the additional information.
>>>
>>> I'll try backing up everything this weekend then will take a stab at it.
>>>
>>> someone said earlier that the differing raid superblocks were probably
>>> the cause of the misassignment in the first place. but I have no clue
>>> how the superblocks could have become messed up, can any of you comment
>>> on that? willl I need to hack at that issue, too, before I can succeed?
>>>
>>> thanks again!
>>>
>>>   
>>>       
>>>> Nataraj
>>>>     
>>>>         
>> I would first try adding the drives back in with:
>>
>> mdadm /dev/mdN -a /dev/sdXn
>>
>> Again, this is after having stopped the bogus md arrays.
>>     
>
> Nataraj, that worked fine, didn't need to --force it. Now I'm back to
> having two devices in md0 and two in md1, and they're the RIGHT two! :)
> Put the box in single-user mode to do the work, then after the array
> finished resyncing, rebooted and it came up with the right two md devices.
>
> I appreciate your tutoring me on this, you've been most helpful.
>
> Thanks a bunch!
>
> Oh, can you refer me to any good documentation on how to admin a
> software raid system? One aimed for people, like me, who are 
> computer literate, but have never trained as a sysadmin, and who
> don't know much about RAID...
>
> thanks again!
>
> Fred
>   
Hi Fred,

You might try this one, since it seems to be one of the more up to date:
https://raid.wiki.kernel.org/index.php/Linux_Raid

Also the mdadm man page and running "mdadm --help".

Oh, and there's this, however, some of the pages just happen to be in 
Chinese...
http://wiki.centos.org/Search?action=fullsearch&titlesearch=1&value=raid 
<http://wiki.centos.org/Search?action=fullsearch&titlesearch=1&value=raid>

Nataraj



Nataraj




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