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-   -   Hardware freezes on Dell Optiplex 320 whilebooting(https://bugzilla.redhat.com/show_bug.cgi?id=499204) (http://www.linux-archive.org/centos/405915-hardware-freezes-dell-optiplex-320-whilebooting-https-bugzilla-redhat-com-show_bug-cgi-id-499204-a.html)

"Jason Pyeron" 07-29-2010 09:31 PM

Hardware freezes on Dell Optiplex 320 whilebooting(https://bugzilla.redhat.com/show_bug.cgi?id=499204)
 
> -----Original Message-----
> From: centos-bounces@centos.org
> [mailto:centos-bounces@centos.org] On Behalf Of Akemi Yagi
> Sent: Thursday, July 29, 2010 16:39
> To: CentOS mailing list
> Subject: Re: [CentOS] Hardware freezes on Dell Optiplex 320
> whilebooting(https://bugzilla.redhat.com/show_bug.cgi?id=499204)
>
> On Thu, Jul 29, 2010 at 1:27 PM, Tom H <tomh0665@gmail.com> wrote:
>
> > There seem to be two solutions, replace grub with lilo or grub2,
> > neither of which conform to your "not invasive on the system or
> > procedure" requirement.
> >
> > Akemi Yagi suggested that you install F13 and chainload CentOS. It
> > sounds nuts but it seems like the right solution to avoid
> messing with
> > your default CentOS install - F13 as a bootloader (!). It
> reminds me
> > of a colleague who has a Mac and keeps a minimal OSX install to boot
> > F12 because he couldn't get F12 to work as a single-boot OS.
>
> I myself have one desktop machine that refuses to cooperate
> with grub (or should I say grub refuses to cooperate with the
> hardware?). Long story short, I installed lilo and decided
> not to spend more time on the problem. The machine has been
> running fine for years... :)

Is there a yum way of installing lilo? Will it work with the devicemapper?
(assumption is no)


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Akemi Yagi 07-29-2010 10:08 PM

Hardware freezes on Dell Optiplex 320 whilebooting(https://bugzilla.redhat.com/show_bug.cgi?id=499204)
 
On Thu, Jul 29, 2010 at 2:31 PM, Jason Pyeron <jpyeron@pdinc.us> wrote:

> Is there a yum way of installing lilo? Will it work with the devicemapper?
> (assumption is no)

You can find some lilo-related information in this Forum thread:

https://www.centos.org/modules/newbb/viewtopic.php?viewmode=flat&topic_id=22591&forum=3 7

I understand device-mapper support (partial?) was added to lilo some
time ago but do not know the details.

Akemi
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Ross Walker 07-29-2010 10:22 PM

Hardware freezes on Dell Optiplex 320 whilebooting(https://bugzilla.redhat.com/show_bug.cgi?id=499204)
 
On Jul 29, 2010, at 5:31 PM, "Jason Pyeron" <jpyeron@pdinc.us> wrote:

> Is there a yum way of installing lilo? Will it work with the devicemapper?
> (assumption is no)

As long a LILO can boot the kernel off /boot and /boot is a Linux or MDRAID partition all the device-mapper related stuff will be done within the initrd.

As far as mirrored /boot is concerned, if LILO is set to look in that partition and it's file system is ext2/3 it can grab the kernel file. It's read-only during boot and the mdraid meta-data is kept at the end of the partition, so it should look and behave as a normal ext file system.

-Ross

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Robert Heller 07-30-2010 12:43 AM

Hardware freezes on Dell Optiplex 320 whilebooting(https://bugzilla.redhat.com/show_bug.cgi?id=499204)
 
At Thu, 29 Jul 2010 18:22:07 -0400 CentOS mailing list <centos@centos.org> wrote:

>
> On Jul 29, 2010, at 5:31 PM, "Jason Pyeron" <jpyeron@pdinc.us> wrote:
>
> > Is there a yum way of installing lilo? Will it work with the devicemapper?
> > (assumption is no)
>
> As long a LILO can boot the kernel off /boot and /boot is a Linux or
> MDRAID partition all the device-mapper related stuff will be done
> within the initrd.
>
> As far as mirrored /boot is concerned, if LILO is set to look in that
> partition and it's file system is ext2/3 it can grab the kernel file.
> It's read-only during boot and the mdraid meta-data is kept at the end
> of the partition, so it should look and behave as a normal ext file
> system.

The only 'tricky' bit is making sure that the LILO MBR stuff is
'mirrored' -- you just need to duplicate /etc/lilo.conf, changing disk
to install lilo on (this is what I use -- I mirror /dev/sdaN with /dev/sdbN):

sed s/sda/sdb/g </etc/lilo.conf >/etc/lilo.conf-b
/sbin/lilo -C /etc/lilo.conf
/sbin/lilo -C /etc/lilo.conf-b

Actually, I don't think lilo cares what file system /boot is. Unlike
grub, it does not even look at the 'file system' information at all.
The lilo 'installer' (the program that runs on the running Linux
system), just grabs the LBAs (used to convert to CHS) of the physical
data blocks of the files (/boot/vmlinuz... and /boot/initrd...) and
stores these addresses someplace, and stores the LBAs (used to convert
to CHS) of where this infor is stored in the MBR. Lilo's boot loader
just does low-level BIOS disk reads to read what it needs to read,
using this raw LBAs (used to convert to CHS) info. Lilo is *simple* and
*primitive* and is not bogged down trying to be clever.

MD's RAID works at the physical disk I/O level, so the all of the disks
in a RAID1 mirror set have the same data at the same physical disk
locations (same LBAs).

>
> -Ross
>
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>

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