Re: [Xen-users] Time change conundrum

[Niall Fleming <niall.fleming@xxxxxxxxxxxxxxxxx>]

So there's nothing to 'fix' it really...

I tried changing the clocksource to jiffies in the domu, but the problem's already there
before this point, as the machine starts with the wrong time!

;)

Ack.

Niall Fleming BSc. (Hons)
Systems Administrator
Webanywhere Limited

Phone: 0800 862 0131 Ext: 203
Web: http://www.webanywhere.co.uk

Aire Valley Business Centre, Lawkholme Lane, Keighley, BD21 3BB
Registered in England with company number 4881346

On 02/11/2011 23:16, Florian Heigl wrote:

Does the very short answer
"the domU time is calculated from a counter that is based of the dom0
uptime measured in nanoseconds - unless the domU is using
clocksource=jiffies" make it clearer?

Actually I'm not sure I got it 100% right on a technical point of view
now (tired, zzzzz), but the basic meaning is right:
You might be seeing a corner case where nothing but a dom0 reboot would help.
But I think you can also change the domU clock source at run-time, so
that might be preferrable right now.

My "datacenter" also didn't set the system clocks to UTC after some
maintenance. I resorted to a 2hour-downtime for the database boxes.
Not great. Time for yet another nagios check ;)

Florian

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