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Re: [Xen-API] [XCP-1.6-BETA] SXM migration - ping timeouts

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.

On Oct 9, 2012 10:33 PM, "George Shuklin" <george.shuklin@xxxxxxxxx> 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):

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?

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