Re: [Xen-users] Verify my understanding of PVs mounting partitions please

[John Haxby <john.haxby@xxxxxxxxxx>]

On 28/06/10 20:48, Lippert, Kenneth B. wrote:
> I haven't been able to test this on my hardware yet, but as I understand
> this should be possible:
>
> I have a computer with several physical partitions: (say /dev/sda1.
> /dev/sdb1, /dev/sdb2).
>
> I build a PV which boots from  a file-based disk image somewhere in the
> /dev/sdb1 partition (/usr1/xen_vm_images/disk0).
>
> > From that PV I can mount one of the real physical partitions (/dev/sdb2)
> and read/write to it.  I can also export it via NFS.
>
> > From the dom0 I can ALSO mount /dev/sdb2 (being careful not to write to
> it).
>    
No; no more than you can share a disk between two machines; the file 
system visible through the read-only mount is dirty, inconsistent and 
changing in ways that read-only file systems are not able to change.
If you want access to the same file system from more than one machine 
(real or virtual) then you need a clustered file system.
jch

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