I want to test the disk IO performance like read, write, random read, random write and so on both in physical machine and VMs (with aufs file system). Also I want to test the throughput performance in a single bare machine and VMs running on the hypervisor to get how much performance loss in Virtual machine (KVM).

I used this command before, but it wasn't enough,and it just tested 1 process! (you can see the output here)

iozone -Mce -I -+r -r 256k -s 2g -f iozone_$i.dat$$ -i0 -i1 -i2

What command should I use?

I want to test the disk IO performance like read, write, random read, random write and so on both in physical machine and VMs (with aufs file system). Also I want to test the throughput performance in a single bare machine and VMs running on the hypervisor to get how much performance loss in Virtual machine (KVM).

I used this command before, but it wasn't enough,and it just tested 1 process! (you can see the output here)

$ iozone -Mce -I -+r -r 256k -s 2g -f iozone_$i.dat$$ -i0 -i1 -i2

What command should I use?