Re: RAID1 all bootable
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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