[linux-lvm] LVM and *bad* performance (no striping)

[Jorg de Jong]

Joe Thornber wrote:
> 
> On Mon, Feb 26, 2001 at 04:44:34PM +0100, Urs Thuermann wrote:
> > I tried to use LVM today using Linux 2.4.2 and it mostly works like I
> > expected.  But the performance is unacceptably bad:
> 
> Every now and then someone posts to the list claiming LVM performance
> is really bad.  We go off and try it and find the overhead is
> typically less than 1%.
> 
> Normally people are trying to stripe to two partitions on the same
> device, but you aren't.
> 
> Is any one else on the list seeing a similar performance hit ?
> 
> - Joe

here are my stats... (be your owen judge....)

Jorg

[root] /root > time dd if=/dev/hde of=/dev/null count=100000
100000+0 records in
100000+0 records out
0.200u 1.050s 0:03.95 31.6%	0+0k 0+0io 116pf+0w

[root] /root > time dd if=/dev/vg00/vm of=/dev/null count=100000
100000+0 records in
100000+0 records out
0.160u 0.860s 0:02.92 34.9%	0+0k 0+0io 116pf+0w