[ale] Adding Raid 1 After The Fact

[Lightner, Jeff]

Planning and pretesting before implementing in Production - Where's the
fun in that?

 

Seriously though thanks for posting this.

 

________________________________

From: ale-bounces at ale.org [mailto:ale-bounces at ale.org] On Behalf Of
gene.poole at macys.com
Sent: Monday, February 08, 2010 1:17 PM
To: ale at ale.org
Subject: [ale] Adding Raid 1 After The Fact

 

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
<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
 
Proud partner. Susan G. Komen for the Cure.
 
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