Re: [Xen-users] Slow IO in VM

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Tue, May 18, 2010 at 03:38:29PM +0530, Arpan Jindal wrote:
>    Hello all
>    I have installed  XEN 3.0.3-94 on RHEL 5.4  on HP DL540 with 32GB RAM and
>    16core processing power and 5*146GB hdd in RADE 5,
>    In the guest VM I have assigned 2 files and 3 devices as VM disk, with
>    30GB RAM and 14core, VM is Havinf RHEL 5.2 on it
>    1) /abc/abc.img -- which is os disk for vm of 10 gb which is hda in VM
>    2) /dev/hda5 - this is a device which is of 30GB used for data in VM hdb
>    in VM
>    3) /abc/abc2.img -- this is a file which is used as another data disk for
>    VM this of 70GB hdc in VM
>    4) /dev/hda6 - this is a device which is of 390 GB and having  hdd in VM
>    And when we are copying data from hdb from to hdd(which is having LVM in
>    guest VM) its taking very long its getting copied at 10-30 MB per minute.
>    kindly let me know if i have to enable something to make the copy process
>    faster. may be some setting in VM or at base machine
>

Is this an HVM (fully virtualized) guest? 

Based on the /dev/hda it sounds like it.. either run PV guest instead,
or install pv-on-hvm drivers.

-- Pasi


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