[CentOS-virt] Bad Disk Performance of domU

Wed May 20 03:39:50 UTC 2009
Christopher G. Stach II <cgs at ldsys.net>

----- "Francisco Pérez" <fperez.x at gmail.com> wrote:

> OK, here it is:
> 
> name = "vm01"
> uuid = "2fa05fe5-9b52-3527-5bf5-efb88555c567"
> maxmem = 5836
> memory = 5836
> vcpus = 1
> bootloader = "/usr/bin/pygrub"
> on_poweroff = "destroy"
> on_reboot = "restart"
> on_crash = "restart"
> vfb = [ ]
> disk = [ "tap:aio:/var/lib/xen/images/vm01.img,xvda,w" ]
> vif = [ "mac=00:16:3e:15:6f:cd,bridge=xenbr0" ]
> 
> Thanks.

What kind of "disk performance"?  Read?  Write?  Random?  Linear?

As for general tuning, use block devices (LVM) unless you have to do otherwise.  Do you do a large amount of I/O in general?  Do you have dom0's CPU pinned to an unshared core?

-- 
Christopher G. Stach II