[SATLUG] lvm2 and raid 0

[Todd W. Bucy]

I am getting ready to build a new box in the next couple of days. 
However I can only afford two 500 gig drives.  I would eventually like
to expand to four or six 500 gig drives.  If I set my first two up as
Raid 1 can I latter and another drive and change to Raid 5 without
having to back up, format, and re-setup my system.  Or would I be better
off setting up an LVM.  I want the speed benefits as well as the
redundancy benefits of Raid but I also want the ease of adding
additional drives latter when I can afford them.

Thanks in advance for any advice you can offer
Todd

John Pappas wrote:
> On Jan 6, 2008 5:20 PM, Chris Lemire <good_bye300 at yahoo.com> wrote:
>
>   
>> Having redundancy and striping requires at least 3 hard disks, right?
>>
>>     
>
> Beyond Daniel's input,  Striping requires 2, Mirroring requires 2, others
> (R3,4,5) require 3.  There are some redundancy configs that require more
> than that (hybrid raid, raid "6"), but fundamentally, redundancy infers
> copy, so there must be a way to explicitly or implicitly derive the copy.
>