Re: [Xen-users] About the time of live migration, it is too long

[Tomasz Chmielewski <mangoo@xxxxxxxx>]

Yin Xu schrieb:
> Hi,all
> I am currently doing some research about the live migration feature of 
> xen. It is said that the downtime can be less than 1 sec. But I can not 
> get this result. I being the live migration ,and "ping" the guest IP,and 
> found the total down is more than 30 seconds. > Than I tried migration 
> without live it only stop about 15 minutes!
> So I am really puzzled about the result, why this happen?
ARP tables are perhaps not updated on your switches; that's why you 
don't get any replies to ping.
Try either (or both):
- using arping instead of ping,
- start "ping" command from within your guest (i.e., some other host in 
the network), then do a live migration.
Did the migration time decrease?


As of "without live" migration - as I understand you correctly - did it 
take fifteen minutes for you? Either your guest has to be very big (lots 
of RAM), your network is very slow (packet losses etc. - check the speed 
of migration with a tool like iptraf or bwm).

--
Tomasz Chmielewski
http://wpkg.org


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