[CentOS] 4 X 500 gb drives - best software raid config for a backup server?

> a LVM over several raid 1's is effectively raid10 as LVM will stripe the 
> volumes across the devices.   It would be nice if  LVM could do 
> mirorring too (like LVM on AIX does) and was tighter integrated with the 
> file system tools (again, like LVM on AIX...  grow a LV and it grows the 
> JFS thats sitting on it, transparently and online).
>
>   

You heretic! Why are you asking for ZFS?


(btw the raid10 module is relatively new and is different from doing 
raid1+raid0 and is not supported by anaconda unlike raid1+0)