Autostart RAID1 on boot

Autostart RAID1 on boot

[Spencer Tuttle]

Why do I need to run mdadm -A -ap /dev/md_d0 /dev/sda /dev/sdb to start 
my array everytime I boot?  This seems like I will never be able to boot 
from this array if I have to run this command.

What do I have to do to autostart this array on boot?

Thanks,
Spencer

Re: Autostart RAID1 on boot

[Ross Vandegrift]

On Tue, Nov 15, 2005 at 09:50:59AM -0700, Spencer Tuttle wrote:
> What do I have to do to autostart this array on boot?

Read Documentation/md.txt in your kernel source.  Has lots of cool
options for setting up kernel assembly on boot.

If you have a reasonably recent array with persistent superblocks,
something like this will do you fine for your root partition:
	md=0,/dev/hda1,/dev/hdc1

If you use initrd/early userspace stuff then you can also drop mdadm
in your initrd image and get it to start the array.  If you're using
Debian, it's mkinitrd scripts automatically support that if you get
things setup properly.

-- 
Ross Vandegrift
ross@lug.udel.edu

"The good Christian should beware of mathematicians, and all those who
make empty prophecies. The danger already exists that the mathematicians
have made a covenant with the devil to darken the spirit and to confine
man in the bonds of Hell."
	--St. Augustine, De Genesi ad Litteram, Book II, xviii, 37

Re: Autostart RAID1 on boot

[Spencer Tuttle]

Ross Vandegrift wrote:
> On Tue, Nov 15, 2005 at 09:50:59AM -0700, Spencer Tuttle wrote:
> 
>>What do I have to do to autostart this array on boot?
> 
> 
> Read Documentation/md.txt in your kernel source.  Has lots of cool
> options for setting up kernel assembly on boot.
> 
> If you have a reasonably recent array with persistent superblocks,
> something like this will do you fine for your root partition:
> 	md=0,/dev/hda1,/dev/hdc1
> 
> If you use initrd/early userspace stuff then you can also drop mdadm
> in your initrd image and get it to start the array.  If you're using
> Debian, it's mkinitrd scripts automatically support that if you get
> things setup properly.
> 

That was it I was appending "md=d0,hda,hdb".

I changed to to "md=d0,/dev/hda,/dev/hdb" and It starting working like a 
champ.

Thank You