Re: LVM over RAID

[Alvin Oga <aoga@ns.Linux-Consulting.com>]

hi ya pete

On Fri, 23 Jul 2004, Pete Clarke wrote:

> Just treat each drive as a seperate device (i.e JBOD) and create a PV for
> each disc and use software striping where necessary, or define each array as
> one big RAID 0 (backup is taken care of) and create lots of little
> partitions to use as PV's?

raid0 is a bad idea ...
	if any one of the 5 or 7 disks dies, than the rest of the data
	on the other disks are also instantly rendered useless 

jbod of is fine ... since the disks does NOT depend on the others

> I am basically looking for the solution that provides the best balance
> between performance (speed is really an issue) and flexibility.

if you have 5 disks ... all identical... your mtbf is .2*MTBF

best balance ...

	- get 3 new 300GB drives ( $250ea ) and backup the data 2x on the
	other 2 spare disks ...

if speed is an issue ... mirror than stripe um properly ... vs stripe than
mirror but it all depends on the data and partitions too

c ya
alvin