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RE: AW: [Xen-users] Best way to use iSCSI in domU

  • To: "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: Nathan Eisenberg <nathan@xxxxxxxxxxxxxxxx>
  • Date: Fri, 19 Jun 2009 10:22:51 -0700
  • Accept-language: en-US
  • Acceptlanguage: en-US
  • Delivery-date: Fri, 19 Jun 2009 10:23:49 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: Acnwp1lcIOZxd/oRSzulnEMpLiPqWgAWuOyA
  • Thread-topic: AW: [Xen-users] Best way to use iSCSI in domU

That wouldn't be any different than if they were on separate Dom0s.  You're 
talking about having two systems accessing the same block device.

Honestly, for data that I need shared between multiple Dom0s or DomUs, I use 
NFS, and it still works great.

Best Regards
Nathan Eisenberg
Sr. Systems Administrator
Atlas Networks, LLC

-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Angel L. Mateo
Sent: Thursday, June 18, 2009 11:29 PM
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: RE: AW: [Xen-users] Best way to use iSCSI in domU

El jue, 18-06-2009 a las 13:43 -0400, Jeff Sturm escribiÃ:
> We had a similar experience, however with AoE rather than iSCSI.  The
> xennet drivers were fast when benchmarked on a single DomU.  We hadn't
> anticipated the slowdown when many DomU's were hitting xennet for block
> storage, cluster multicast and plain HTTP traffic all at once.
> Exporting block devices from DomU instead was much more successful.  The
> performance bottleneck seemed to vanish, we could tune the network as we
> see fit (e.g. multipath / jumbo frames, good for storage), and the phy:
> backend allows for asynchronous writes (although the latter prevented us
> from doing this on shared GFS filesystems).
        OK. But supppose I need two domUs (in the same dom0) needing the same
iSCSI resource. Could they share it if I configure it in the dom0?

Angel L. Mateo MartÃnez
SecciÃn de TelemÃtica
Ãrea de TecnologÃas de la InformaciÃn       _o)
y las Comunicaciones Aplicadas (ATICA)      / \\
http://www.um.es/atica                    _(___V
Tfo: 868887590
Fax: 868888337

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