Re: grub segmentation fault on RAID 1 lvm

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On Fri, 2005-08-26 at 22:34 -0600, David G. Miller (aka DaveAtFraud)
wrote:
> shawn@xxxxxxxxxxxxxxx wrote:
> 
> >On Friday, August 26, 2005 6:28 PM, Craig White wrote:
> >  
> >
> >>>
> >>>Nothing wrong with lilo - grub seems to work better.
> >>    
> >>
> >
> >This is not so true with RAID.  Grub does not support it like lilo does.
> >In fact, my experience is that grub-install does not work with RAID1
> >/boot partitions at all out of the box.  With lilo, it will
> >automatically make the mirrors of RAID 1 both bootable and active with a
> >boot image after lilo is executed.  You can literally kill either drive
> >and still be able to boot into the degraded one.  In order to do this
> >with grub, the boot image must be installed onto both drives manually,
> >or it must be patched as Bill described.
> >
> >  
> >
> >>>
> >>>I think that there are thousands of people successfully 
> >>>running Fedora and a few people that are struggling can 
> >>>mislead others into thinking that there are some problematic 
> >>>issues with the defaults but typically, they have varied from 
> >>>the defaults.
> >>>
> >>    
> >>
> >
> >No one is being misled here.  In fact, my implementation only uses
> >stable Fedora rpms from the base and update repositories.  David is
> >implementing a good solution.  I was using lilo on both FC1 and FC2
> >without problems.  In fact, it never really made much sense to me for
> >Fedora to offer RAID during the install and then not provide a valid
> >RAID-compatible boot image automatically across all drives (it did on
> >FC1 because lilo was still an option). Maybe grub2 will prove more
> >promising.
> >
> >--
> >
> >Shawn 
> >
> >
> >  
> >
> Thanks, Shawn.  "Couldn't have said it better myself."
> 
> I mainly wanted to point out that lilo supports RAID 1 *natively*.  No 
> fuss, no custom scripts, etc.; it "just works." 
> 
> If someone is a grub developer and they want to help implement software 
> RAID support in grub, they should have at it.  On the other hand, if 
> someone wants a simple, easy to install and maintain implementation of 
> software RAID for Fedora, they should use lilo for their boot loader; 
> not grub.  The current incarnation of grub doesn't inherently support 
> software RAID and that support needs to be there if folks like Fedora 
> are going to offer lvm and RAID 1 as an install option for /boot.  
> Sadly, lots of people out there with stock installs of Fedora probably 
> think that their system will survive a hit to their system disk because 
> they think that software RAID 1 will keep it running.
----
hmmm...I probably haven't done software RAID since RHL 7.x and obviously
lilo and didn't know the difference but I vaguely recollect issues with
booting from LVM. 

On these 'stock installs' that you refer to - there are 2 options...1 is
to auto partition and setup and the other is to do it yourself - which
presumes a little on knowing what you are doing.

http://www.redhat.com/docs/manuals/enterprise/RHEL-4-Manual/sysadmin-
guide/s1-raid-diskdruid-manual-devmnt.html

curiously, this says that if you put /boot into a RAID array, it must be
in a RAID 1 configuration only but it doesn't say anything about
choosing lilo - I wonder if anaconda does this automatically if you
put /boot into a RAID 1 array...

Craig


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