'Live' Migrate messes up NTP on FreeBSD domU - any suggestions?
Roger Pau Monné
roger.pau at citrix.com
Mon Nov 2 17:40:54 UTC 2015
El 02/11/15 a les 16.09, Karl Pielorz ha escrit:
>
> Hi,
>
> We run a number of 10.x boxes under XenServer 6.5. On those boxes we run
> NTP as a client with a few local time servers on the network to keep
> the time in sync on that VM.
>
> There's a number of big threads on the Citrix forums about whether you
> should, or shouldn't run NTP in domU's - but the consensus seems to be
> you need to in order to keep the domU's clock accurately in sync.
>
> This works fine.
>
> However if we run a live migrate (to another XenServer node) or Xen
> Storage Motion migration - the domU's ntp gets messed up. The time on
> the domU is generally "ok" - but ntpq gives output like:
>
> "
> ntpq> pe
> remote refid st t when poll reach delay offset jitter
> ===========================================================================
> ntp0 193.67.79.202 2 u 931 1024 377 0.232 -4977.5 4207.29
> ntp1 66.228.38.73 3 u 890 1024 377 0.267 -4988.5 4616.94
> ntp2 64.246.132.14 2 u 990 1024 377 0.324 -4978.0 4207.98
> "
I'm sorry, but I have no idea about ntpd, what does the above mean? The
offset is too big with other peers and ntpd simply disconnects?
There were some issues that I fixed some time ago regarding migration
and PVHVM guests:
http://xenbits.xen.org/gitweb/?p=xen.git;a=commit;h=f8e8fd56bd7d5675e8331b4ec74bae76c9dbf24e
http://xenbits.xen.org/gitweb/?p=xen.git;a=commit;h=32c864a35ece2c24a336d183869a546798a4b241
You should make sure XenServer has both of this commits.
Roger.
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