Re: [Xen-users] XCP and Openfiler as the storage

[Bart Coninckx <bart.coninckx@xxxxxxxxxx>]

On 04/06/11 19:38, Eduardo Bragatto wrote:
> On Apr 6, 2011, at 2:34 PM, Rudi Ahlers wrote:
>
> > On Wed, Apr 6, 2011 at 7:18 PM, Eduardo Bragatto
> > <eduardo@xxxxxxxxxxxx> wrote:
> > > Hello FG,
> > >
> > > sorry to bring up this question again, but I'm really curious about
> > > the fact
> > > the LUN might be accessed by more than one hypervisor at the same time.
> > >
> > > Did you encounter the any problems like I described below?
> > >
> > > Best regards,
> > > Eduardo
> >
> > How do you access the same LUN from different hypervisors, without
> > corruption?
> AFAIK, you can if you use a shared filesystem on top of the LUN, like GFS.
>
> FG was kind enough to answer me in private but it's still not clear to
> me how he is doing it. If he doesn't answer here I will update the
> thread later with the information he might provide.
>
> Best regards,
> Eduardo
>
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Just jumping in here and I might have smissed some info, but accessing 
the same LUN from different hypervisors is no problem whatsoever. It's 
like a SCSCI drive that can be connected to several hosts (yes, a SCCSI 
bus can be shared by several machines).
The thing though is that only one hypervisor should actively use it and 
write to it.
We do this and access is regulated by clustering software.


Rgds,

B.




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