[CentOS-virt] Bad Disk Performance of domU
fperez.x at gmail.com
Wed May 20 15:40:30 UTC 2009
I guess the bad performance it goes with the writing. For example on
decompression of a big tar.gz, installing rpm packages. Also on restoring a
The first clue when i knew that something were wrong was on the FS formating
stage. It took really long time to format 40 GB to ext3. I did the same on
other machine with a sata disk... surprise! same software and hardware
config except for the inferior disk type and did it in no time.
2009/5/19 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
> CentOS-virt mailing list
> CentOS-virt at centos.org
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