You forgot the most important step.

Step 0: ensure you have a valid backup of your data.

On 3/26/09, Federico [off-list ref] wrote:

Hi all,
I've two disks in RAID1 formatted with reiserfs which, in my system,
has  amazingly poor performance... I want to switch to ext3 and in a
couple of kernel releases to upgrade to ext4.
This is my plan:

1 - Remove one disk from the array
2 - Format the removed disk with ext3 filesystem
3 - Copy all the data from the degradeted RAID to the newly ext3-formatted
disk
4 - Create a new degradeted RAID1 with the ext3 disk
5 - Modify grub and reconfigure mdadm to boot in the ext3 RAID1 disk.
6 - Reboot.
7 - Reformat the reiserfs disk
8 - Add the formatted disk to the ext3 RAID and start to syncing.

Is there a more easy and failproof method?
I'm a bit scared to lose same (or all) of my data during the process...
Thank you for your help :P
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