[CentOS] CentOS 6.2 software raid 10 with LVM - Need help with degraded drive and only one MBR

Jonathan Vomacka juvix88 at gmail.com
Fri Mar 2 16:00:50 EST 2012


On 3/2/2012 2:46 PM, Bowie Bailey wrote:
> On 3/2/2012 1:01 PM, m.roth at 5-cent.us wrote:
>> Digimer wrote:
>> <snip>
>>> Boot from a live CD using the CentOS 6.2 install media. Once booted:
>>>
>>> <bash># grub
>>> <grub>  root (hd0,0)
>>> <grub>  setup (hd0)
>>> <grub>  root (hd1,0)
>>> <grub>  setup (hd1)
>>> <grub>  root (hd2,0)
>>> <grub>  setup (hd2)
>>> <grub>  quit
>>> <bash># reboot
>>>
>>> This assumes that grub sees the drives at '0, 1 and 2' and the boot
>>> partition is the first on each drive. If it is, when you type 'root
>>> (hdX,0)' it should report that a file system was found. The 'setup
>>> (hdX)' will tell grub to write the MBR to the specified disk.
>> THANK YOU! I could have used that once or twice, and had no idea that grub
>> could create a std. MBR.
>
> When I set up a RAID 1, I do it like this:
>
> device (hd0) /dev/sda
> root (hd0,0)
> setup (hd0)
> device (hd0) /dev/sdb
> root (hd0,0)
> setup (hd0)
> device (hd0) /dev/sdc
> root (hd0,0)
> setup (hd0)
>
> This way, all the drives are set up as if they are hd0.  This way, any
> of them will boot normally as a stand-alone drive.
>

Bowie, in terms of RAID 10, each drive technically cant be standalone 
right? The drives are striped and mirrored.


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