Does your ntpdate have the -B option?? If so, it can make the adjustment slowly.

From the Gentoo Linux manpage:

   -B     Force  the  time  to always be slewed using the adjtime()

system call, even if the measured offset is greater than +-128 ms. The default is to step the time using settimeofday() if the offset is greater than +-128 ms. Note that, if the offset is much greater than +-128 ms in this case, that it can take a long time (hours) to slew the clock to the correct value. During this time. the host should not be used to synchronize clients.

From the NOTES section of the adjtime(3) man page:

   The adjustment that adjtime() makes to the clock is carried out in

such a manner that the clock is always monotonically increasing. Using adj- time() to adjust the time prevents the problems that can be caused for certain applications (e.g., make(1)) by abrupt positive or negative jumps in the system time.

Ralph Mitchell

On Mon, Sep 8, 2008 at 10:10 PM, Rich Smrcina <rsmrcina at wi.rr.com> wrote:

Posting for a friend....

I've been testing out Hobbit in a SLES 10 virtual machine on z/VM. It is a monitoring application based off of Big Brother. So far, it works great except for one weird thing. We have a cron task that runs once a night that does ntpdate to sync the time with an NTP server. If the time is in sync, no problem. However, if the time is out of sync and is adjusted, Hobbit freezes. The tasks still exist, but they just stop doing anything. Apache continues to display the same web page without an update. Stopping the Hobbit daemon doesn't help, in fact, it does nothing. The tasks never stop. I have to recycle the entire system in order to free it up.

Has anyone seen a problem similar to this? Any ideas?

-- Rich Smrcina VM Assist, Inc. Phone: 414-491-6001 Ans Service: 360-715-2467 rich.smrcina at vmassist.com http://www.linkedin.com/in/richsmrcina

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In <48C5E934.3030303 at wi.rr.com> Rich Smrcina <rsmrcina at wi.rr.com> writes:

I've been testing out Hobbit in a SLES 10 virtual machine on z/VM. It is a monitoring application based off of Big Brother. So far, it works great except for one weird thing. We have a cron task that runs once a night that does ntpdate to sync the time with an NTP server. If the time is in sync, no problem. However, if the time is out of sync and is adjusted, Hobbit freezes. The tasks still exist, but they just stop doing anything. Apache continues to display the same web page without an update. Stopping the Hobbit daemon doesn't help, in fact, it does nothing. The tasks never stop. I have to recycle the entire system in order to free it up.

Generally, Hobbit gets pretty confused if time goes back. If you must play around with the system clock regularly, I'd suggest stopping Hobbit while doing so.

It will wreak havoc on your statistics, though ..

Regards, Henrik