Re: Bad Disk Performance of domU

[Francisco Pérez <fperez.x@xxxxxxxxx>]

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  MySQL Database...

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.

Regards Francisco.

2009/5/19 Christopher G. Stach II <cgs@xxxxxxxxx>

----- "Francisco Pérez" <fperez.x@xxxxxxxxx> wrote:

> OK, here it is:
>
> name = "vm01"
> uuid = "2fa05fe5-9b52-3527-5bf5-efb88555c567"
> maxmem = 5836
> memory = 5836
> vcpus = 1
> bootloader = "/usr/bin/pygrub"
> > > > > > > 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

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