[ale] Adding Raid 1 After The Fact

[Brandon Checketts]

I've done that several times on a remote system, and it is kindof fun.
It definitely tests your understanding of hard disks, partitioning, and
the boot process.

http://www.brandonchecketts.com/archives/setting-up-software-raid-on-a-running-centos-5-server

Thanks,
Brandon Checketts


gene.poole at macys.com wrote:
> List,
> 
> Sometime ago I asked whether or not Raid 1 could be added to a system
> with CentOS 5.3 already installed and running.  Well this one of the
> answers I found, and the answer that I used:
> 
>        
> http://www.howtoforge.org/how-to-set-up-software-raid1-on-a-running-lvm-system-incl-grub-configuration-centos-5.3
> 
> 
> The entire document is 4 pages long and quite detailed.  But you must
> modify it to your implementation, specifically if you do not use the
> default partitioning scheme.  Here are some caveats that may not be
> listed in the document:
> 
>    1. If you perform this process, I would do it at the server console.
>    2. Be sure that the situation is stable, a surprise re-boot may have
>       you pulling out your hair (except for me, I don't have any).
>    3. If you have a non-production machine, try it there first.
>    4. Document everything, and I mean every fdisk -l; pvs; vgs; and lvs.
>        In other words, know your environment completely.
>    5. I would print and read the document before starting.
> 
> 
> I know this because I messed up my test machine 3-times, but in the end
> my production machine went perfectly.
> 
> Thanks,
> Gene Poole
> 
> 
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