Re: AW: [Xen-users] cowloop and XEN - doesn`t work for me

[Matthias Laug <matthias.laug@xxxxxxxxxx>]

Hi,

problem solved. Just use the generated cowdevice and not the cowfile. It 
should work like this
disk = [ 'phy:/dev/cow/0,sda1'.......]

Greetings
Matthias

Matthias Laug wrote:
> Hi,
>
> did you get any result for cowdevices... I tried to start a domain 
> with a cowdevice and I got this kernel panic:
> Kernel panic - not syncing: VFS: Unable to mount root fs on 
> unknown-block(8,1)
> Is there any possibility, so that DomU can handle this block device?
>
> Thanks for any help
> Mattes
>
>
> Stephan Seitz wrote:
> > Hi,
> >
> > to get cow capabilities, i used cownfsd ( 
> > http://www.russross.com/CoWNFS.html ) on an external box, targetting 
> > to a mounted cluster-fs. domU's (as well as the dom0's) of the xen 
> > boxes has been booted from this cow-enabled nfs shares. in small 
> > setups, a cownfsd should also work on a single domO.
> > your target may vary, but my intention was keeping the fs as 
> > transparent as possible to the domU's.
> >
> > greetings
> >
> > Stephan Seitz
> >
> >
> >
> > -----Ursprüngliche Nachricht-----
> > Von: xen-users-bounces@xxxxxxxxxxxxxxxxxxx im Auftrag von devzero@xxxxxx
> > Gesendet: Fr 07.04.2006 22:29
> > An: cowloop@xxxxxxxxxxxxxxxx; xen-users@xxxxxxxxxxxxxxxxxxx
> > Betreff: [Xen-users] cowloop and XEN - doesn`t work for me
> >
> > Hello !
> >
> > Is anybody using cowloop (http://www.atconsultancy.nl/cowloop/) with 
> > XEN ?
> > i want to use this for saving diskspace and time for copying 
> > rootfs-images.
> > the module compiles and loads fine (was done by a colleague)
> >
> > cowloop - (C) 2005 AT Consultancy/AT Computing
> > cowloop - version: 2.15
> > cowloop - info: www.ATConsultancy.nl/cowloop
> > cowloop - maximum allowed cowdevices: 16
> > cowloop - initialized
> >
> > after installation and creating the device nodes i see the control 
> > device like this:
> > xen2:/tmp# ls -la /dev/cow/ctl
> > brw-r-----  1 root root 241, 255 2006-03-03 12:49 /dev/cow/ctl
> >
> > but when i use cowdev, it fails :
> >
> > xen2:/tmp# cowdev -a /tmp/test.ro /tmp/test.cow
> > /dev/cow/ctl: No such device or address
> >
> > cat /dev/cow/ctl
> > cat: /dev/cow/ctl: No such device or address
> >
> > cat /etc/debian_version
> > 3.1
> >
> > uname -a
> > Linux xen2 2.6.12.6-xen0 #2 Thu Mar 2 11:59:01 CET 2006 i686 GNU/Linux
> >
> >
> > is somebody successfully using cowloop on xen0 for providing 
> > cowloop`ed blockdevices for xen-guests ?
> > i`m not sure if the problem is with cowloop, or with xen - or a 
> > compatibility issue of both.
> > maybe someone can help here?
> >
> > regards
> > roland k.
> > systems engineer
> >
> > ------------------------------------------------------------------------
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
>
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