increasing LVM performance

[prometheanfire]

You can add cache=none to the options when defining a disk. This has been tested to eliminate the performance hit of caching and increase IO performance of guests.

http://permalink.gmane.org/gmane.comp.emulators.kvm.devel/48471

http://www.linux-kvm.org/page/Tuning_KVM explains the situation a bit more.

 

[dietmar]

We will add that to the GUI in V2.0. For now, you can add it manually in the VM config (see 'man qm')

 

[ansanto]

We will add that to the GUI in V2.0. For now, you can add it manually in the VM config (see 'man qm')

ide0: cluster10-11:vm-113-disk-1,cache=none

is that correct?

 

[prometheanfire]

I use the following format

virtio0: vm-os:vm-103-disk-1,cache=none

 

[ansanto]

thanks for your reply.

 

[veebr0]

Dear friend Just a question, where can I configure in promox 7.1 this configuration?

Thanks a lot
Eviny

 

[prometheanfire]

on the disk line in the conf file

cat /etc/qemu-server/101.conf

name: http
bootdisk: virtio0
ostype: l26
memory: 1024
onboot: 0
sockets: 1
boot: c
freeze: 0
cpuunits: 1000
acpi: 1
kvm: 1
cores: 4
description: dns,wiki,blog<br>10.0.1.3
vlan3: virtio=12:12:12:12:12:12
virtio0: vm-os:vm-101-disk-1,cache=none​

 

[veebr0]

Ohhh, prompt answer, thanks a lot, This applied for all VKM Machine, I have 3 VKM :

2 Windows 2003 r2 with virtio disk type
1 A distribution named SME 7.4 based on Centos with IDE disk type with VLM enable

Thanks again.