On Apr 27, 2012, at 10:58 AM, Bob Hoffman wrote:

On 4/27/2012 10:52 AM, aurfalien wrote:

...

Hi all,

Please excuse the many posts.

Wondering if any one can help me with the the setup.

I have 2x2TBdisks. I would like to mirror them. I would like to create two LVMs so that I can snap shot from one to the other.

During Centos 6 install, how would I go about this as its confusing?

So far I am here;

1. Created the following raid devices;

md0 500MB (use it for /boot) md1 4000MB (use it for swap) md2 All remaining space (use it for /)

2. Created two physical LVMs, one on md0, the other on md1.

3. ?

This is were I am confused, do I create two LVM volume groups?

I was thinking that my primary LVM can be ~1TB and that my other LVM which I snapshot to can also be ~1TB.

Anyways, I am very green on this topic as I usually do hardware raids but I don't have that option.

Thanks in advance,

• aurf

md0, your boot, cannot be a physical volum...so don't add things to it... md1 and md2 can be merged, make instead md1 with all remaining space. create a raid partition on each drive with 'remaining space' (making sure both are the same size) then create a physical volume raid device and select each drive that has the big raid partition

then select create volume group... add /swap and '/' to as mount points, these will be volume groups. there is a drop down when adding a mount point that determines file type, one is 'swap'

you only need one group..

the physical volume holds the logical group, which holds the logical volumes.

Wow, I think I did it.

Re read your reply a few times and yea, nice man.

Thanks much for the reply.

Did three LVMs; / ~1TB swap ~4GB /snapshot ~900GB

Very very cool.

- aurf