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@lists.xensource.com im Auftrag von devzero@web.de Gesendet: Fr 07.04.2006 22:29 An: cowloop@ATConsultancy.nl; xen-users@lists.xensource.com 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@lists.xensource.com http://lists.xensource.com/xen-users
Matthias Laug
2006-Apr-25 10:04 UTC
Re: AW: [Xen-users] cowloop and XEN - doesn`t work for me
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@lists.xensource.com im Auftrag von devzero@web.de > Gesendet: Fr 07.04.2006 22:29 > An: cowloop@ATConsultancy.nl; xen-users@lists.xensource.com > 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@lists.xensource.com > http://lists.xensource.com/xen-users_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Matthias Laug
2006-Apr-25 13:07 UTC
Re: AW: [Xen-users] cowloop and XEN - doesn`t work for me
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@lists.xensource.com im Auftrag von devzero@web.de >> Gesendet: Fr 07.04.2006 22:29 >> An: cowloop@ATConsultancy.nl; xen-users@lists.xensource.com >> 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@lists.xensource.com >> http://lists.xensource.com/xen-users > > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users