Re: RAID1 all bootable

[Alexandru Cardaniuc <cardaniuc@gmail.com>]

Similar thing happened to me recently, so now after the reinstall and
creation of RAID-1 (md0 device) I run manually:
# grub-install /dev/sdb

Because it seems that the debian installer just does it for the primary
disk in RAID-1 (grub-install /dev/sda).

Any reason the installer doesn't by default install it on both devices
in the RAID-1?


Simon Vos <simonvos@gmail.com> writes:

> Have you assembled you raid devices again (mdadm --assemble /dev/mdX /dev/sdX)?
>
> That should still work with the disk that was used for your RAID-1, when that's done you can mount your disk, chroot into it and run
> grub-install /dev/sda (and grub-install /dev/sdb, so you won't have this problem in the future ;-)).
>
> On 2 March 2013 11:10, Francesco Pietra <chiendarret@gmail.com> wrote:
>
>     A further piece on information. With knoppix 7.0,  the procedure for
>     examining mdadm arrives at
>    
>     cat /proc/partitions
>     sda
>     sdb
>    
>     RAID1 (md0 md1) is not seen. I assume that this is the way Knoppix
>     behaves in this situation.
>    
>     Thanks
>     francesco pietra
>
>     ---------- Forwarded message ----------
>     From: Francesco Pietra <chiendarret@gmail.com>
>     Date: Sat, Mar 2, 2013 at 10:11 AM
>     Subject: Re: RAID1 all bootable
>     To: Lennart Sorensen <lsorense@csclub.uwaterloo.ca>, amd64 Debian
>     <debian-amd64@lists.debian.org>, debian-users
>     <debian-user@lists.debian.org>
>
>     Is this recipe devised for installing grub on both sda and sda with an
>     undamaged RAID1?
>    
>     In my case, with the sda that contained grub loader replaced by a new
>     disk, the rescue mode  (using the same CD installer for amd64 wheezy)
>     did not find any partition. Inverting the SATA cables, same result.
>    
>     In both cases (I mean position of SATA cables) I went to the shell in
>     the installer environment:
>    
>     #fisk /dev/sda (or sdb)
>      device contains neither a valid DOS partition table, nor Sun, etc
>     (expected for a raid)
>    
>     #dmesg |grep -i sd
>      sda (and sbb): unknown partition table (expected for a raid), however
>     md: raid0
>     md: raid1
>     were identified, along with rai4, 5, 6 etc (unfortunately "| less"
>     does not work to see the whole message).
>    
>     Am I using the Rescue Mode improperly? I was unable to dig into the HD
>     that contains md0 (booth loader, EXT2) and md1 ( LVM partitions home
>     tmp usr opt var swap EXT3)
>    
>     Thanks a lot for your kind advice
>    
>     francesco pietra
>
>     On Fri, Mar 1, 2013 at 10:35 PM, Lennart Sorensen
>     <lsorense@csclub.uwaterloo.ca> wrote:
>     > On Fri, Mar 01, 2013 at 08:20:09PM +0100, Francesco Pietra wrote:
>     >> Hi:
>     >> With a raid1 amd64 wheezy, one of the two HDs got broken.
>     >> Unfortunately, I had added grub to sda only, which is just the one
>     >> broken. So that, when it is replaced with a fresh HD, the OS is not
>     >> found. Inverting the SATA cables of course does not help (Operative
>     >> System Not Found). In a previous similar circumstance, I was lucky
>     >> that the broken HD was the one without gru.
>     >>
>     >> Is any way to recover? perhaps through Knoppix? I know how to look
>     >> into undamaged RAID1 with Knoppix.
>     >>
>     >> Also, when making a fresh RAID1 from scratch, where to find a Debian
>     >> description  of how to make both sda and sdb bootable? (which should
>     >> be included by default, in my opinion)
>     >
>     > You can boot the install disk in rescue mode, select the root partition
>     > to chroot into, then run grub-install from there.
>     >
>     > When grub asks where to install, you should configure it for both sda
>     > and sdb.  I think 'dpkg-reconfigure grub-pc' is where that is selected.
>     > Might need it to use -plow to asks all levels of questions.  Not sure.
>     >
>     > --
>     > Len Sorensen
>
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