Vps Slow Speed

[kis2a]

hello , i 9 vps in action

pve-manager: 1.7-11 (pve-manager/1.7/5470)
running kernel: 2.6.32-4-pve
proxmox-ve-2.6.32: 1.7-30
pve-kernel-2.6.32-4-pve: 2.6.32-30
qemu-server: 1.1-28
pve-firmware: 1.0-10
libpve-storage-perl: 1.0-16
vncterm: 0.9-2
vzctl: 3.0.24-1pve4
vzdump: 1.2-10
vzprocps: 2.0.11-1dso2
vzquota: 3.0.11-1
pve-qemu-kvm: 0.13.0-3
ksm-control-daemon: 1.0-4

i installed proxmox (No-Raid)
1 Disque space 3657,56 for proxmox and vm

in my vm :

vm 101 : 10% user, 3% kernel, 86% IO, 0% idle
vm102 : 2% user, 0% kernel, 97% IO, 0% idle

Why IO is very big ?

this installe is not good ?

is good to create one partition for vm ?

Thanks