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Q: How to move filesystems (including root and boot) from one drive to another

I recently decided that my build server was running too slow (disk bound) and went out and bought a 3ware 9650SE controller and disks.

Got the array configured as a single RAID 5 logical unit (yes, I know, RAID 5 has slow writes...) and ran fdisk on the unit to create partitions.

I formatted the partitions...

I mounted each of the partitions and did the following:

# cd /old-fs-mnt-point
# find . -depth -mount -print0 | cpio --null -pdv /new-fs-mnt-point

then I ran:

# mkswap ...
# hal-device | less

to get the UUID's. I edited the new /boot/grub/grub.conf and /etc/fstab and rebooted. Oops. Didn't quite work. Needed to change the BIOS drive assignment order so that the array was now /dev/sda.


System hung: forgot to install the boot blocks.

Hmmm... Tried to run "install-grub /dev/sda" from the Live CD, but that didn't work. Something about not being able to figure out the BIOS drive number... don't understand why that's relevant, but that's a different story...

So I reran the installer, using a small partition that I had left for whatever... and it wrote the boot blocks and MBR.

Editted /boot/grub/grub.conf to change back the default to what I wanted... and rebooted.

Now the system hangs at:

Red Hat nash version 6.0.52 starting
Unable to access resume device (/dev/sda3)
mount: error mounting /dev/root on /sysroot as ext3: No such file or
setuproot: moving /dev failed: No such file or directory
setuproot: error mounting /proc: No such file or directory
setuproot: error mounting /sys: No such file or directory
Mount failed for selinuxfs: on /selinux: No such file or directory
switchroot: mount failed: No such file or directory

This is FC9 (updated) x86_64 on a Phenom/NVidia MB.

What have I forgotten?

Moving filesystems used to be a lot easier (these are plain ol' ext3 filesystems... I'm not using LVM)... and I thought the whole UUID support was to simplify moving drives around, etc.

Doesn't seem to be the case. (Ah, for the days when just about everything that caused a booting system to hang was pretty much self-evident and transparent...)

There's a certain amount of tweaking I've done of the configuration, the rpm's I've installed, accounts created, kernel variables that I tune... it's kind of painful to have to do a reinstall from scratch.

Also, I wanted to peek inside the initrd.*.img files and see if there was anything in there choking up... but I couldn't figure out how to mount them as loopback filesystems.

Any revelation of these mysteries appreciated.


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