[CentOS] Re: RAID5 - MBR and default grub config on CentOS 4
Bryan J. Smith
b.j.smith at ieee.org
Mon Aug 29 17:40:07 UTC 2005
Robert Hanson <roberth at abbacomm.net> wrote:
> greetings,
> i just know i have read several times on this list and in
> other places that on a RAID5 array that the MBR should be
> placed on the /boot partition.
Let's clarify that is a software RAID-5 (via MD).
And I don't think people mean the master boot record (MBR),
which can only go in cylinder 0 of the hard drive -- before
any disk slicing.
They mean you should make a separate /boot filesystem where
the kernel and initrd go.
> is this truly correct and if so, why?
Because kernel and any initrd (which contain the software
RAID support) must be loadable by the 16-bit Int13h Services.
If the /boot directory is in a filesystem that is a
software/OS stripe set (such as RAID-3/4/5/6/etc...), then
16-bit Int13h Services can't read it.
> my experiences of putting the MBR on the /boot partition
> are contrary to that it will even work and boot that way...
Correct. I think they are referring to the kernel/initrd
files in a separate /boot filesystem that is not software
RAID (or only RAID-1/mirror).
--
Bryan J. Smith | Sent from Yahoo Mail
mailto:b.j.smith at ieee.org | (please excuse any
http://thebs413.blogspot.com/ | missing headers)
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