[CentOS] /dev/sda

Tue Dec 6 21:33:51 UTC 2011
m.roth at 5-cent.us <m.roth at 5-cent.us>

Les Mikesell wrote:
> On Tue, Dec 6, 2011 at 2:39 PM,  <m.roth at 5-cent.us> wrote:
>>> 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)?!
> Just keep in mind that you can fix it from an install disk booted in
> rescue mode if you get it wrong, so don't panic if it won't boot.

Oh, I know that - I'm not a newby on this. On the other hand, I *am* new
to Linux software RAID with /boot RAIDed.

> But, if you have a similar box it would be a good idea to practice -
> and to be sure someone is around the production box when it is
> rebooted the first time.

I think you missed where I was doing this on the clone box, and we will
reboot it tomorrow, then I'll do it to the live one Thursday. I don't play
around without knowing what the numbers are on production.