Re: Moving to LVM

[randall <randall@songshu.org>]

André Berger wrote:
> Hi there!
>
> I'm on Etch and have got two external USB disks, one GB each in size.
> Disk1 contains one ext3 partition and my media files, and is full.
> Disk2 is empty and should take future media files. I don't have a
> third disk I could use for backups.
>
> My plan is to create a Logical Volume Group to span two partitions
> located on different disks, and export that LV group via NFS. If I
> got it right (please correct me), I need partitions of type 8e on
> both disks. So I thought I
>
> 1 partition disk2 8e 
> 2 create a LV group and add disk2/p1 to it
> 3 create an ext3 filesystem on the LV
> 3 copy the data from disk1/p1 to the LV
> 4 partition disk1/p1 8e
> 5 add disk1/p1 to the LV group
> 6 resize the LV ext3 filesystem to 2 TB, so it spans both disks resp.
>   partitions
>   
you're basically on the right track, but there are 3 things to 
understand about LVM
1 Physical Volume
2 Volume Group
3 Logical Volume

1 in this case is disk1 and (eventually) disk2
2 is (eventually) disk1 + disk2 together so they appear as one
3 is a partition you can place on 2

> What happens if, for whatever reason, just one of the disks is
> available?
>   
to make a long story short,
if you combine the 2 disks as one, you are going to wish you had a third 
disk for backups.
> -André
>
>   


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