Re: [Xen-users] Sharing filesystems between VMs.

[Jean-Christophe Guillain <jcg@xxxxxxxxxx>]

Andy Davidson writes: 

> Hi, folks -- 
>
> I'm using xen 2.0.6 on a Debian Sarge host, and Linux 2.6.11.10-xen0. 
>
> I use Xen to host a number of QA environments. 
>
> I'm mounting filesystems for guest vms from files on disk.  Ideally, I 
> would like to share a single 'file' between all VMs for /usr/local and 
> another ext3 partition, and maintain individual root and swap partitions 
> on a per-machine basis. 
>
> This doesn't seem to work presently.  When I bring up the 'second' machine 
> in the cluster, I get : 
>
> qa-host:/etc/xen/auto# xm create xm-manager
> Using config file "xm-manager".
> Error: Error creating domain: vbd: Segment not found: 
> uname=file:/export/vm/vm-usrlocal 
>
> If I then shutdown the machine 'holding' this partition I can bring up the 
> VM as normal. 
>
> qa-host:/etc/xen/auto# xm create xm-manager
> Using config file "xm-manager".
> Started domain VM8, console on port 9614 
>
> Is this a limitation that I can not work around ?  A limitation that an 
> upgrade or alternative method of storing the filesystem will fix ? 
>
> Ideally I'd like to avoid the situation where I physically export the 
> partitions I want to use on guest OSes over NFS .. but I am aware that 
> it's an option which will probably work... 
>
> Thanks for any ideas you guys may have .. 
>
> -a
Did you respect the syntax of the disks definitions in your config files 
(expecially the rw rights)? 

"
DISK
Set the first entry in this list to calculate the offset of the domain's 
root partition, based on the domain ID. Set the second to the location of 
/usr if you are sharing it between domains (e.g. disk = 
['phy:your_hard_drive%d,sda1,w' % (base_partition_number + vmid), 
'phy:your_usr_partition,sda6,r' ]
" (from the online documentation) 

jC 

***
Jean-Christophe Guillain 

jcg@xxxxxxxxxx - 06 61 52 20 76
http://www.adviseo.fr - http://www.open-sp.fr 

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