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

  • To: <devzero@xxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: "Stephan Seitz" <s.seitz@xxxxxxxxxxxx>
  • Date: Sun, 9 Apr 2006 22:39:54 +0200
  • Delivery-date: Sun, 09 Apr 2006 13:39:40 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: AcZbzV1hm0k0FmmQQv2QpBZpUiw2KwARo6+8
  • Thread-topic: [Xen-users] cowloop and XEN - doesn`t work for me


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.


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

uname -a
Linux xen2 #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?

roland k.
systems engineer

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