Re: [Xen-users] Shared Storage

[Bart Coninckx <bart.coninckx@xxxxxxxxxx>]

That is completely dependent on your hardware specs and DomU's properties.
It sounds like a lot though. I seem to remember some time ago you also 
stated to want to run at least 100 DomUs on one hypervisor, maybe this 
is again pushing it.
With a decent RAID and 10gbit or infiniband you can go a long way 
though. You should also consider using SCST instrad of IET as it is faster.
B.



On 04/24/11 20:31, Jonathan Tripathy wrote:
> We're talking houndreds, if not thousands of DomUs here. Will iSCSI on
> Linux scale to these large numbers?
>
> Thanks
>
>
> On 24/04/2011 19:13, Jonathan Dye wrote:
> > Why not create one iscsi lun per vm disk instead of carving them up on
> > the hypervisor? That's more typical, and a more typical state of
> > affairs in linux is your friend. Also, you would have just one lun
> > queue if you exported one big PV, instead of one lun queue per vbd.
> > That becomes a problem at scale.
> >
> > - Jonathan
> >
> > ----- Original Message -----
> > From: "Jonathan Tripathy"<jonnyt@xxxxxxxxxxx>
> > To: "Xen List"<xen-users@xxxxxxxxxxxxxxxxxxx>
> > Sent: Sunday, April 24, 2011 11:25:38 AM
> > Subject: [Xen-users] Shared Storage
> >
> > Hi Everyone,
> >
> > I am consider such a setup where I export an iSCSI target to a Xen node.
> > This Xen node will then use the iSCSI block device as an LVM PV, and
> > create lots of LVs for DomU use.
> >
> > I was wondering if anyone could make me aware of any special
> > consideration I would need to take. I've posted a similar question to
> > the LVM list to ask for further tips more specific to LVM.
> >
> > Am I barking down the wrong path here? I know it would be very easy to
> > just an NFS server and use image files, but this will be for a large
> > scale DomU hosting so this isn't really an option. Additionally, if I
> > wanted to make the LVM VG visible to multiple Xen nodes, is it just a
> > matter of running CLVM on each Xen node? Please keep in mind that only
> > one Xen node will be using an LV at any one time (so no need for GFS, I
> > believe)
> >
> > Any help or tips would be appreciated
> >
> > Thanks
> >
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