libvirt users - Jan 2011 - invalid argument error when using cache parameter

hi, 

	i tried to add a 'cache' argument to the 'driver' element in my
	domainxml for qemu/kvm. i tried adding cache="none" as well as
	"writethrough" and "writeback", but every time i get these
errors:

libvirtError: internal error process exited while connecting to monitor: char
device redirected to /dev/pts/1
qemu: could not open disk image /vms/test.img: Invalid argument 

	the full driver line looks like this:
	<driver name="qemu" type="raw"
cache="none"/>

	the same domainxml works just fine without the cache parameter. does
	anyone know what i'm doing wrong? is there some other way to set the
	default cache policy on qemu/kvm? i didn't see anything in the
	config file...


--igor
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Actually, I only get the error when using cache='none' -- writethrough
and writeback both work, and default works also but the cache parameter
is gone from the driver element if I do a dumpxml.

i also forgot to include versions:

cloud1:~# qemu --version
QEMU PC emulator version 0.12.5 (Debian 0.12.5+dfsg-3), Copyright (c) 2003-2008
Fabrice Bellard
cloud1:~# virsh --version
0.8.6

--Igor

On Sat, Jan 22, 2011 at 12:49:55AM -0600, Igor Serebryany
wrote:
> hi, 
> 
> 	i tried to add a 'cache' argument to the 'driver' element
in my
> 	domainxml for qemu/kvm. i tried adding cache="none" as well as
> 	"writethrough" and "writeback", but every time i get
these errors:
> 
> libvirtError: internal error process exited while connecting to monitor:
char device redirected to /dev/pts/1
> qemu: could not open disk image /vms/test.img: Invalid argument 
> 
> 	the full driver line looks like this:
> 	<driver name="qemu" type="raw"
cache="none"/>
> 
> 	the same domainxml works just fine without the cache parameter. does
> 	anyone know what i'm doing wrong? is there some other way to set the
> 	default cache policy on qemu/kvm? i didn't see anything in the
> 	config file...
> 
> 
> --igor

> _______________________________________________
> libvirt-users mailing list
> libvirt-users at redhat.com
> https://www.redhat.com/mailman/listinfo/libvirt-users
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On Sat, Jan 22, 2011 at 12:49:55AM -0600, Igor Serebryany
wrote:
> hi, 
> 
> 	i tried to add a 'cache' argument to the 'driver' element
in my
> 	domainxml for qemu/kvm. i tried adding cache="none" as well as
> 	"writethrough" and "writeback", but every time i get
these errors:
> 
> libvirtError: internal error process exited while connecting to monitor:
char device redirected to /dev/pts/1
> qemu: could not open disk image /vms/test.img: Invalid argument 
> 
> 	the full driver line looks like this:
> 	<driver name="qemu" type="raw"
cache="none"/>
> 
> 	the same domainxml works just fine without the cache parameter. does
> 	anyone know what i'm doing wrong? is there some other way to set the
> 	default cache policy on qemu/kvm? i didn't see anything in the
> 	config file...
What filesystem type is /vms ?  I've seen this error message when
the filesystem did not support O_DIRECT, which cache=none enables

Regards,
Daniel