[CentOS] /dev/sda

[m.roth at 5-cent.us]

Les Mikesell wrote:
> On Tue, Dec 6, 2011 at 1:46 PM,  <m.roth at 5-cent.us> wrote:
>>
>> Booting purposes is the point: /dev/md0 is /boot. And as the slot's
>> ATA0, it should come up as sda. You mention getting the bootloader
>> sectors over - do you mean, after it's rebuilt and active, to then
>> rerun grub-install? Remember, the drive that's failing is /dev/sda. I
>> also don't see why, if I replace the original drive in the original
>> slot (I'm doing this on the clone, whose drive is just fine,
>> thankyouveddymuch), it isn't recognized as /dev/sda.
>
> Booting software RAID1 is kind of an oddball case.  You actually boot
> on the disk that bios considers your boot drive only, and it works
> because the drives are mirrored and happen to look the same whether
> you look at the partition or the raid device.   You need to install
> grub separately onto each disk of the pair, though.  If you get this
> part wrong, you can boot from an install/rescue disk and fix it.
>
Ack! So I actually need to run grub-install, and do it for both; didn't
know that (always had /boot as a plain vanilla primary partition)?!

Thanks, Les.