On 10/09/2012 10:39 PM, Vidar Normann wrote:
Actually, I believe this is because it uses gratuitous arp to let the switch(es) the Xen hosts are connected to become aware that the VM has moved.
That makes sense. Seems some arp tables (at the switch?) isn't updated very quickly unless xs-tools is installed. And without network traffic or link down/up, I guess linux doesn't send arp messages by itself. Trying to ping from the vm itself during the migration seems to be a "workaround".
On Oct 9, 2012 10:33 PM, "George Shuklin" <george.shuk...@gmail.com <mailto:george.shuk...@gmail.com>> wrote: It's really strange. xs tools for pv-domain is just simple shell script to report vm internals back to XCP. You can fake it presence with this script (run on host where VM resides): http://wiki.xensource.com/__wiki/XAPI_fake_presence_of_PV___drivers <http://wiki.xensource.com/wiki/XAPI_fake_presence_of_PV_drivers> But behavior is really funny. May be PV presence cause live migration and 'no guest tools' cause nomal migration (with pause and without iterative incremental memory transfer)? On 09.10.2012 23:23, Burnie wrote: When migrating a VM from one standalone server to another, I noticed that there's a huge gain in making sure the VM has xs-tools installed: VM: Centos 6.3 x86_64 - PV - with xs-tools installed: 206 packets transmitted, 205 received, 0% packet loss, time 205680ms rtt min/avg/max/mdev = 0.204/48.439/197.497/78.066 ms - without xs-tools installed: 209 packets transmitted, 157 received, 24% packet loss, time 208432ms rtt min/avg/max/mdev = 0.217/66.975/196.220/84.136 ms In both cases the VM seems to appear in XC within 1-2 seconds on the new server, but without xs-tools, it doesn't seem to do any networking. I dont know if this is normal or not, but I guess it has something to do with some optimized drivers/modules? _________________________________________________ Xen-api mailing list Xen-api@lists.xen.org <mailto:Xen-api@lists.xen.org> http://lists.xen.org/cgi-bin/__mailman/listinfo/xen-api <http://lists.xen.org/cgi-bin/mailman/listinfo/xen-api> _______________________________________________ Xen-api mailing list Xen-api@lists.xen.org http://lists.xen.org/cgi-bin/mailman/listinfo/xen-api
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