Going from Centos 6 to Ubuntu Server

[Michael Butash]

Should be able to - depends how you're partitioned.

I'm assuming your raid0 is done with mdadm and not fake-raid based.

As long as your boot partition (non-lvm) is large enough to support 
enough kernels, you should be able to install over the system lv's you 
don't want, and not touch the ones that you do.  Probably just create 
new lv's assuming you have the space for new root, usr, var, whatever 
you want.  I usually create home without a separate partition, leaving 
alone the existing home, and simply mount the /home lv after reinstall 
"just in case".

Note I've had some weirdness with ubuntu/mdadm depending what version 
mdadm metadata it was built with.  In 11.04 I had to build md's 
specifically to use 0.90 metadata to work fully (i.e. reboot without 
having to busybox assemble md manually), 11.10 and higher I had to build 
the raid specifically with the current version (default) to work.

I layered luks/lvm/ext4 atop this too, never did figure out exactly 
which was borking it, but the metadata was the trick for me.  It also 
could have been related to my ssd alignment partitioning that always 
gave me grief with low-level fs.

-mb


On 03/21/2012 03:19 PM, Stephen wrote:
> if it boots up and sees the LVM then you should be able to customer
> partition and configure without reformatting.
>
> you can look and see a fair amount without even writing changes to the disk.
>
> However i would still make a backup.
>
> On Wed, Mar 21, 2012 at 1:55 PM, Nadim Hoque<nadimhoque at gmail.com>  wrote:
>> I currently have Centos 6 installed with software raid 0 with LVM. I was
>> wondering if it is possible to install Ubuntu server 10.04 with those
>> settings without data loss and that the current raid/lvm will stay in tact.
>> So far in my experience I should be able to do this, but I just wanted your
>> input on the matter. I might switch to ubuntu server for the vast number of
>> packages in the default repos and when I used it before I really liked it (I
>> love how the default repos have what I want, and ufw is nice as well).
>>
>> --
>> Nadim Hoque
>> Undergraduate Intern
>> ASU Advanced Computing Center
>> Cell: 480-518-6235
>>
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