I can't speak to the performance impact of running storage traffic over OVS. We have storage running over OVS in our small XenServer pool and haven't seen any ill effects, but that isn't much of a test. However, the sFlow instrumentation in OVS gives useful visibility into storage activity, for example, looking at AoE traffic:
http://blog.sflow.com/2011/03/aoe.html Regards, Peter On Apr 5, 2013, at 1:32 AM, Kristoffer Egefelt <kristof...@itoc.dk> wrote: > Thanks for the input - I may not have explained myself properly though - I'm > not considering pci-passthrough. > > What I would like to confirm is, if there's any problems running storage > traffic over OVS, latency/performance wise - in this case using SR-IOV VFs > inside dom0, to seperate the traffic. > > What I think I need is two seperate networks on a XEN host - one for > Openvswitch and one for NFS storage traffic. > The problem here is that I then need to create 2xLACP bonds on the network > cards - which may not be possible. > > The easy way would be to have just one LACP bond, connect OVS to it, and > create a OVS interface for the storage and others for the VMs - but I'm > having doubts if it will impact performance. > > Do you guys run NFS / iSCSI / AOE traffic over OVS or on seperate interfaces > (physical or with SR-IOV(Intel) or nPAR (Broadcom)? > > Thanks ;-) > > Regards > Kristoffer > > > On 05/04/2013, at 07.41.22, Ramana Reddy <gtvrre...@gmail.com> wrote: > >> You can use 10Gb NIC cards, but when you assign vnic to each VM, the traffic >> is directly goes through VNIC, and >> not through OVS. The observed behaviour is that if the traffic goes via >> OVS, you may not see 10Gb speed, and it varies. What is the need of sending >> traffic via OVS. Is there any decision making happening at OVS side. >> >> >> >> On Thu, Apr 4, 2013 at 6:39 PM, Kristoffer Egefelt <kristof...@itoc.dk> >> wrote: >> Hi, >> >> I want to use 10Gig Intel x520 NICs - should I: >> >> - Run storage (iscsi/nfs) over OVS ? >> - Create VFs and run storage and OVS on separate interfaces ? >> - Buy more physical NICs even if I don't need the bandwidth ? >> >> Any experiences with SR-IOV, storage latency or other issues to suggest one >> over the other ? >> >> Thanks >> >> Regards >> Kristoffer >> _______________________________________________ >> discuss mailing list >> discuss@openvswitch.org >> http://openvswitch.org/mailman/listinfo/discuss >> >> _______________________________________________ >> discuss mailing list >> discuss@openvswitch.org >> http://openvswitch.org/mailman/listinfo/discuss > > _______________________________________________ > discuss mailing list > discuss@openvswitch.org > http://openvswitch.org/mailman/listinfo/discuss
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