On Monday March 6, bill@xxxxxxxxxxx wrote:
> Please help me here. I want to create an array containing an active
> partition.
You cannot do that. It would corrupt the active partition.
> I'd like to convert a machine from having a non-raid root to
> having a raid1 root.
It goes like this:
1/ create a degraded array using only the new device
mdadm -C /dev/md0 -l1 -n2 missing /dev/hdc1
2/ make a filesystem there
mkfs /dev/md0
3/ mount and copy over
mount /dev/md0 /mnt
cp -ax / /mnt
4/ update lilo.conf (or grub or whatever) on new filesystem
Also update /etc/fstab
vi /mnt/etc/lilo.conf
chroot /mnt /sbin/lilo
vi /mnt/etc/fstab
5/ reboot
6/ make sure the root filesystem is /dev/md0 and everything look
cool. If not, boot off /dev/hdb1 and try again.
7/ add the original drive to the array
mdadm /dev/md0 -a /dev/hdb1
Done/
> I want to create software raid on two ide drives(hdb and hdc).
> Currently everything is on hdb.
> I want to convert hdb and hdc to raid auto detect.
> I want if one drive fails, the other takes over, therefore all the disks
> should have a boot loader, bios (I mean identical). So that if I take any of
> the disks out, the system still boots. Can I do this and how do I go about
> doing this?
>
>
> On Friday February 3, bill@xxxxxxxxxxx wrote:
> > I had problems with mdadm and what i did was reinstall Fedora Core 4 on my
> > system. I would like to create raid 1 on /dev/hdb1 and /dev/hd1
> > However when i try and create raid on these drives, i get an error from
> > /dev/hdb1 saying that the device is busy. Here's the output i get from the
> > screen.
> > What could be the problem?
> >
> > [root@lab-asterisk ~]# mdadm --create --verbose
> > /dev/md0 --level=1 --raid-devices=2 /dev/hdb1 /dev/hdc1
> > mdadm: Cannot open /dev/hdb1: Device or resource busy
> > mdadm: create aborted
> >
> > [root@lab-asterisk ~]# fdisk -l
> >
> > Disk /dev/hdb: 20.0 GB, 20020396032 bytes
> > 255 heads, 63 sectors/track, 2434 cylinders
> > Units = cylinders of 16065 * 512 = 8225280 bytes
> >
> > Device Boot Start End Blocks Id System
> > /dev/hdb1 * 1 2401 19286001 fd Linux raid
> > autodetect
> > /dev/hdb2 2402 2434 265072+ fd Linux raid
> > autodetect
> >
> > Disk /dev/hdc: 10.2 GB, 10242892800 bytes
> > 16 heads, 63 sectors/track, 19846 cylinders
> > Units = cylinders of 1008 * 512 = 516096 bytes
> >
> > Device Boot Start End Blocks Id System
> > /dev/hdc1 1 19846 10002352+ fd Linux raid
> > autodetect
> > [root@lab-asterisk ~]#
> > [root@lab-asterisk ~]#
>
>
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