[CentOS] changing partition priority on install
Philip.R.Schaffner at NASA.gov
Wed Oct 29 21:55:19 UTC 2008
Monty Shinn wrote:
> Phil Schaffner wrote:
>> On Tue, 2008-10-28 at 14:59 -0500, Monty Shinn wrote:
>>> I am in the process of installing 5.1 64 bit on a server. The server
>>> has 2 3ware cards: 9550SX 12 port, and a 8006 2 port, both SATA.
>> Any reason not to use 5.2? Will save a lot of updates, and perhaps some
>> I have vague recollections of having fixed similar problems by tweaking
>> the device ordering in initrd and/or modprobe.conf; however, backing up
>> a step, why do you need to change the order to make things work? You
>> can install GRUB on the boot device MBR, whatever that may be, and put
>> the OS on the device you want it on without changing the ordering.
> There are a couple of reasons, although they may make no sense. First,
> I did not want a multiple point of failure. If the boot loader is on
> the MBR of /dev/sda, and the os is on /dev/sdb, then you have a multiple
> point of failure. If either card dies, then I am hosed. It would be
> *similar* to running a RAID0 on the os. Not a good idea IMHO.
> Also, if I wanted to replace the "data" drives in the future, I couldn't
> just unmount the partition and replace the drives. The boot loader
> would be gone as well.
A GRUB boot CD (or floppy) will allay the above concerns. Do an "info
grub" to find out how to create one. Can also boot from install media
to recover a lost GRUB.
> I did not find an option during the install prep to re-locate grub to
> the MBR of /dev/sdb. I probably should try the text-based installer to
> see if there are more options.
It is there in the GUI installer - can't remember exactly where without
going through the install, but something like an "Advanced" button on a
configuration page toward the end of the process.
> Heck, I may just remove the 9550 board until the initial os install is
> completed. That should accomplish what I am trying to achieve. Just
> seems like there should be a more elegant way of doing this.
> I am installing 5.1 because I have the isos on hand. I was just going
> to let yum update me to 5.2...
That should work.
> Thanks for your help,
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