Question about LVM and RAID

[Alan Cox]

> > What would happen if one of the RAID arrays failed (e.g. two drives die
> > in RAID 5 array 1)?  Would the data be safe, would I lose all data, or
> > would I just lose the data that was on the failed array?
> 
> Two drives in either RAID will most likely kill your LVM.

If you need two drive reliability you need RAID6 or depending on the
tradeoffs you want to make RAID 5 + hot spare.

For performance you want RAID 1 + 0 (possibly + hot spares)