Comments on: Moving your Linux root partition to software RAID

By: Tyler Wagner

Tyler Wagner — Wed, 18 Jan 2012 10:37:45 +0000

I’ve updated the guide to support GRUB 1 and 2. Thanks.

By: WebDawg

WebDawg — Wed, 18 Jan 2012 03:35:06 +0000

Quote:
”
Edit /boot/grub/menu.list and find the line like this:

# kopt=root=UUID=9e299378-de65-459e-b8b5-036637b7ba93 ro

Replace the UUID with the one you just found. Leave the line commented, and save the file. Now rebuild menu.lst to use the new UUID:
”

You want to edit the /boot/grub/grub.cfg and replace the many UID entries there instead.

I may still keep the old instructions for the old grub though?

By: Tyler Wagner

Tyler Wagner — Tue, 17 Jan 2012 08:23:37 +0000

Excellent. Perhaps you’d be so kind as to write updated commands for Grub 2? I’ll edit the post to include them.

By: WebDawg

WebDawg — Mon, 16 Jan 2012 23:41:52 +0000

A gem among the internet sir. I am going to clone this on my wiki for personal storage (with a link to this site!) but this saved me alot of time.

The newer grub has a different file though. grub.cfg if I remember.

Still. Perfect.

By: Tyler Wagner

Tyler Wagner — Thu, 11 Aug 2011 09:37:43 +0000

Thank you for the tip, Kevin. You are correct; my procedure isn’t concerned with hard links, extended attributes, or ACLs. Add “-HXA” to rsync to get them, but it will be slower. My exclusions list avoids the expected locations of weird things, but it would be bad if someone mounted a drive in an unexpected place.

The reason I use rsync is so that I can run it multiple times, right up until the switchover, for minimum downtime and no loss of data between when the copy is run, and swapping over. My procedure can be run on a live system right up until the final rsync.

I’m amused to see that dump is no longer installed by default on Ubuntu.

By: kjw

kjw — Thu, 11 Aug 2011 05:47:29 +0000

rather than rsync, I recommend dump. It’ll properly transfer everything on your disk, like extended security attributes, and hard linked files, and automatically avoid anything weird. Just precede this with a mkfs, and you can be sure that everything is clean (dump|restore does not delete files, only add them)

cd /
dump -0 -f – / | (cd /mnt && restore -rf -)

By: Don Radick

Don Radick — Wed, 07 Apr 2010 21:21:57 +0000

Thanks for the very informative guide!
I recently had to move my root file system from one pair of Raid1 disks to another pair of Raid1 disks, and was totally non-plussed to find that although grub appeared to be working, I would get dumped into a BusyBox prompt by initramfs.
Although the BusyBox prompt didn’t say, I found I could run mdadm from there, and found that the UUID of the Raid1 filesystem was different from the new one I had prepared.
After a bit of googing, I found this page which pointed me in the direction of a fix.
Using your chroot method and update-initramfs worked like a charm.

gracia amigo.

By: tyler

tyler — Thu, 29 Oct 2009 22:42:17 +0000

Hi Mudgen,

What’s the exact command with mkinitrd? Any switches? It would be good to have it here.

By: Mudgen

Mudgen — Thu, 29 Oct 2009 17:36:33 +0000

What a great post! I’m actually familiar with all the pieces, but it’s terrific to have them put together in a road map.
Surprised the original Centos poster did not call out that the update-initramfs equivalent on Redhat/Centos/Fedora would be mkinitrd.

By: Help setting up LinuxRAID-1 in opensuse 11.1 - Page 2 - openSUSE Forums

Help setting up LinuxRAID-1 in opensuse 11.1 - Page 2 - openSUSE Forums — Sun, 05 Jul 2009 15:50:14 +0000

[...] if this go well. I have find this next 2 pages: Fundaci