Re: [PLUG] Converting from single-disk to mirrored

[Chris Heerschap <ChrisMH@AWeber.com>]

On 3/4/13 8:17 PM, Casey Bralla wrote:
> Related question:  Can you simply add a second drive to a system to create a
> RAID mirror system?
>
> I've got a server that crashed last year and then I f'ed up the restore.  I'd
> like to add a RAID mirror, but thought I had to start off that way from a clean
> install.  is there an easy way to setup RAID on a running system?

Quite some time back I was curious if this was possible, and had a RHEL 
system at my disposal to test with, and actually succeeded in going from 
a one disk system to a mirrored setup.  I documented it at the time:

http://db94.net:8080/wtf/pmwiki.php?n=Main.ConvertingInstallationToMirrored

Whole buncha caveats apply, and I only did it because I didn't care 
about the data on the system.  Since then, I've actually come to the 
conclusion that having good OS backups and a quick way to restore the OS 
is far more effective than having a software mirrored OS.  I've found 
that using "dump" is a really good way to back up the OS and have used 
it for recovery, DR tests, as well as system cloning.


cmh



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