[kwlug-disc] Recovering a software raided machine.

[Bob Jonkman]

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Joe Wennechuk wrote:
> I have dd'd  /dev/sdb instead of /dev/sdb1 ?? What is the
> difference?

sdb will get you the entire drive, including the partition table and
master boot loader, and all the partitions sdb1, sdb2...sdbn

If you've only got one partition sdb1, and you're backing up data
because the MBR is damaged, then you're probably fine with just sdb1

I don't know how this works with MBR's replacement, GPT (GUID
Partition Table).

- --Bob, who wouldn't mind a deep geek presentation on GPT and UEFI.


On 14-03-11 04:26 PM, Joe Wennechuk wrote:
> Thank you for this. I got knoppix to boot up, and I am dd'ing the
> drive right now before I try any repair steps. I dd'd only the
> partition /dev/sdb1,  it is the only partition on the drive. I was
> wondering does anyone know should I have dd'd  /dev/sdb instead of
> /dev/sdb1 ?? What is the difference?
> 
> ----------------------------------------
>> Date: Tue, 11 Mar 2014 15:17:45 -0400 From: unsolicited at swiz.ca 
>> To: kwlug-disc at kwlug.org Subject: Re: [kwlug-disc] Recovering a
>> software raided machine.
>> 
>> Boot favourite distro, chroot into your disks (once you get them
>> mounted with the live cd). Do what you gotta do to follow the
>> below.
>> 
>> Been here, done this! (Remembered to put it in tiddlywiki,
>> even.)
>> 
>> mkdir /mnt/chroot mount /dev/sda1 /mnt/chroot for i in dev sys
>> proc; do mount -o bind /$i /mnt/chroot/$i; done chroot
>> /mnt/chroot
>> 
>> update-grub <eeyyy>
>> 
>> 
>> eeyyy - etc., etc., yada, yada, yada
>> 
>> 
>> On 14-03-11 01:22 PM, William Park wrote:
>>> On Tue, Mar 11, 2014 at 10:36:57AM -0400, Joe Wennechuk wrote:
>>>> I have a machine that will not boot. I'm getting a message to
>>>> insert boot media after post, and that's it.
>>> 
>>> This usually means that BIOS can't find boot loader. So, boot
>>> in rescue mode or from different boot partition, and reinstall
>>> boot loader (grub, lilo).
>>> 
>>>> It has two drives in it, and I believe they were set up as a
>>>> mirror using mdadm. Can I just take one or both of the drives
>>>> out, and plug it in via USB converter? Is there anything I
>>>> will have to do besides that?
>>> 
>>> 
>>> _______________________________________________ kwlug-disc
>>> mailing list kwlug-disc at kwlug.org 
>>> http://kwlug.org/mailman/listinfo/kwlug-disc_kwlug.org
>>> 
>> 
>> 
>> _______________________________________________ kwlug-disc
>> mailing list kwlug-disc at kwlug.org 
>> http://kwlug.org/mailman/listinfo/kwlug-disc_kwlug.org
>> 
> 
> _______________________________________________ kwlug-disc mailing
> list kwlug-disc at kwlug.org 
> http://kwlug.org/mailman/listinfo/kwlug-disc_kwlug.org
> 
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