[CentOS] building software raid.

[Johan Vermeulen]

Op 02-11-13 15:26, Johan Vermeulen schreef:
> Op 01-11-13 17:41, Johan Vermeulen schreef:
>> Op 30-10-13 17:38, John Doe schreef:
>>> From: Johan Vermeulen <jvermeulen at cawdekempen.be>
>>>
>>>> no I see I have /dev/md/md_d0 /dev/md_d0p1 /dev/md_d0p2
>>>> I don't know what is what....
>>> Not sure what you did with lvm but I would say that md_d0 is
>>> the (raid) device and md_d0p* are its partitions...
>>> Just do fdisk -l /dev/md/md_d0 (or gdisk).
>>>
>>> JD
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>> Hello All,
>>
>> fdisk -l was what I needed to bring clarity in the name-issue.
>>
>> By now I tried this on a just-installed Centos6.4, updated machine, this
>> time with partitions instead of lvm.
>>
>> I was able to follow the wiki all the way without EM
>> /etc/fstab now reads
>>
>> //dev/md_d0p3   root
>> /dev/md_d0p1  home /
>>
>> and so on.
>>
>> I adapted /etc/grub.conf to /root=/dev/md_d0p3/ and deleted the rd_NO_MD
>> and ran the dracut commands.
>>
>> BUT when rebooting I get :
>> /dracut warning : No root device "block:/dev/md_d0p" found./
>>
>> searching through all the files, I see that /dev/mapper only contains
>> control in stead of
>> the usual links.
>>
>> Could this be the issue?
>> And if it is, how can I generate or manualy add the usual links in this
>> file?
>>
>> Greetings, J.
>>
>>
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> /Dear All,
>
> I would like to renew my request for help with this wiki:
>
> http://wiki.centos.org/HowTos/Install_On_Partitionable_RAID1
>
> Still stuck on EM : dracut warning: No root device "block:/dev/md_dop3"
> found.
> I think this is a bit of a pain to troubleshoot, because
>
> * to change anything, I have to chroot to /mnt/sysimage every time.
> * googling this, I see a a threat marked solved here :
> https://www.centos.org/modules/newbb/print.php?form=1&topic_id=43676&forum=55&order=ASC&start=0
>
> but I can't access it.
>
> So far I tried this :
>
> *  http://lists.centos.org/pipermail/centos/2013-March/133176.html
>
> so i ran  dracut --mdadmconf initramfs.......
>
> but that did change anything
>
> *
> http://grokbase.com/t/centos/centos/133qevz1d8/cant-find-root-device-with-lvm-root-after-moving-drive-on-centos-6-3
> also mentions an almost empty /dev/mapper,
> so I am now trying to make a correct symlink in /dev/mapper in order to
> be able to boot the system.
>
> So far I haven't found the right one.
>
> Can anyone shed some light on this?
>
> Many thanks.
>
> J./
> //
>
>
>        //
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Dear All,

more or less solved by following this url:

http://infoliser.com/how-to-configure-software-raid1-with-centos-6-x/

Some issues remain with the bootloader.

Friendly regards, J.