Re: [Xen-users] Shared Storage

[John Madden <jmadden@xxxxxxxxxxx>]

> I would honestly prefer to manage hundred of LVs instead of hundreds of
> LUNs. I'm just concerned about the iSCSI bottleneck (if any) if I were
> to create an LVM VG using a single iSCSI LUN for about 50 - 100 LVs. Any
> advice is appreciated.
I'd be more concerned over iSCSI itself being able to scale based on 
your workload, especially if you're doing it over GbE.  Even 50 VMs 
doing relatively little though concurrently could cause problems given 
the nature of iSCSI (TCP overhead, latency of ethernet, etc).  My feel 
for this is that the fewer-LUN-more-LV route would be more efficient 
because you'll have fewer block device queues and multipath call-outs 
and such but that's just a guess on my part.  Test it out, see which one 
is better.  If there's  no difference, go with the one that's easier to 
manage.
John




--
John Madden
Sr UNIX Systems Engineer / Office of Technology
Ivy Tech Community College of Indiana
jmadden@xxxxxxxxxxx

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users