[BlueOnyx:01776] Re: RAID-1 From 3 to 2 drives

[Michael Stauber]

Hi Steve,

> I made the mistake of doing a BO clean install with three drives. I don't
> recall being asked if I wanted a RAID-1 or RAID-0, however.
>
> I would like to keep this new BO server as a two drive Software RAID-1.
>
> How do i rebuild the RAID into a two drive RAID-1, at the command line,
> thus without reinstalling BO

Easiest way is to unplug the 3rd drive and do a reinstall. Once the OS is 
installed, plug the third drive back in. That will give you RAID1 over two 
disks and you have the third disk that you can format and mount manually for 
extra storage.

2nd best option is to reinstall with all three drives connected, but starting 
the install with "self" (type self at the CD splash screen), which will launch 
into disk druid. That allows you to partition and set up the drives yourself.

Lastly, you could edit /etc/fstab, /etc/mtab, /etc/raidtab and the lvm 
configuration to remove the third drive from the RAID1, reformat it and re-
attach it at a separate mountpoint. That can be done without reinstalling (can 
even be done remotely), but it involves quite a few steps on the command line.

-- 
With best regards

Michael Stauber