Moving a server over to a RAID

justino garcia jgarciaitlist at gmail.com
Fri Aug 20 16:36:09 UTC 2010


acronis for linux will just create a image that you can restore later

On Thu, Aug 19, 2010 at 11:41 PM, Mike A. Leonetti
<mikealeonetti at gmail.com>wrote:

>  (2010年08月19日 22:36), justino garcia wrote:
>
> Why not use acronis for linux, or some imaging tool, but make sure your
> current linux install has support for said raid card.
>
> On Thu, Aug 19, 2010 at 12:09 PM, Rashkae <ubuntu at tigershaunt.com> wrote:
>
>> Mike A. Leonetti wrote:
>> >  I have a server now that has one drive and is not set up on a RAID
>> > using Ubuntu 8.04.
>> >
>> > What I was going to do was boot with a Linux recovery disc, create a
>> > RAID1 manually with mdadm on two new drives, and then copy all of the
>> > data onto that then redo the boot partition.
>> >
>> > My question is, when I reboot, will Ubuntu automatically detect the RAID
>> > for me or are there modules I have to install ahead of time to make sure
>> > the RAID gets detected? Also, would anybody else handle the situation
>> > differently :D.
>> >
>>
>>  There is going to be one hurdle you'll need to get over.. I forget the
>> exact command I used to recover, but I'll give you the overview.
>>
>> When raid array's are created, they are given a "hostname", which, by
>> default, will by the system hostname.  By default, mdadm will not
>> auto-assemble raid arrays from a different hostname (to prevent
>> misunderstandings when hard drives are moved between different systems.)
>>  Unfortunately, Ubuntu must assemble the raid arrays from the Initrd
>> system, which will probably not contain your hostname unless you have
>> customized it.  I encountered this problem when I created the new array
>> from the existing system, I do not know if you will have this issue when
>> creating the array from the rescue cd.
>>
>> When I tried to reboot the system, it was unable to mount the root
>> filesystem.  However, initrd dropped me to a busybox shell, from which I
>> was able to run mdadm with options that would assemble the correct array
>> *and* update the hostname of the array, (which I think is simply "", ie.
>> empty, in initrd.)
>>
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>
>
>
> --
> Justin
> IT-TECH
>
> To be honest I don't necessarily trust third party tools.  And I'm doing
> this all on-site so if it's something that fails that means I'll just have
> to be there for longer.
>
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>


-- 
Justin
IT-TECH
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