Re: Debian testing Software Raid 1 Migration

[Chris Boot <bootc@bootc.net>]

Prepaid wrote:

> Hello
>
> So I am currently running Debian Linux (testing) on a system. I want
> to migrate over to RAID 1 (software) for data redundancy in the case
> of a hard drive failure. I'm running the 2.4.30 kernel with RAID built
> in (not module).
>
> I've run the command:
>
> mdadm --create /dev/md0 --level 1 --raid-device=2 missing /dev/hdc1
>
>
> It creates the array and everything is fine it appears in /proc/mdstat
> but upon rebooting the system will not realize the array.
>
> I realize I could update mdadm.conf and then have it autosense them
> but I want the bios to read them from the superblock on the drive but
> have no idea what I'm doing wrong.
>
> Any one got any ideas? I read the article on the howtos but am totally
> stumped. I need to get mdadm to install the Persistent Superblock but
> it should by default... hmm
>
> Thanks!
>  
Hi,

Well, since you're using mdadm it has created a superblock, but the 
kernel probably doesn't know to look for it. You need to make sure you 
change the partition type from the usual 83 / Linux to fd, which is 
"Linux raid autodetect".

Also, does your kernel attempt any autodetection at all? Can we see a 
dmesg if the above doesn't work?

HTH,
Chris

--
Chris Boot
bootc@bootc.net
http://www.bootc.net/