WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-users

Re: [Xen-users] Shared Storage

To: Jonathan Tripathy <jonnyt@xxxxxxxxxxx>
Subject: Re: [Xen-users] Shared Storage
From: John Madden <jmadden@xxxxxxxxxxx>
Date: Mon, 25 Apr 2011 13:34:49 -0400
Cc: "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>, Bart Coninckx <bart.coninckx@xxxxxxxxxx>, Jonathan Dye <jdye@xxxxxxxxxxxxxxxxxxxxx>
Delivery-date: Mon, 25 Apr 2011 10:36:47 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <4DB5A762.2000405@xxxxxxxxxxx>
List-help: <mailto:xen-users-request@lists.xensource.com?subject=help>
List-id: Xen user discussion <xen-users.lists.xensource.com>
List-post: <mailto:xen-users@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
References: <1162000549.239932.1303675286200.JavaMail.root@mail> <4DB48268.3080602@xxxxxxxxxx> <46C13AA90DB8844DAB79680243857F0F0AFFF2@xxxxxxxxxxxxxxxxxxx> <4DB576AD.8080203@xxxxxxxxxxx> <4DB5A762.2000405@xxxxxxxxxxx>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.14) Gecko/20110223 Thunderbird/3.1.8
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

<Prev in Thread] Current Thread [Next in Thread>