ROOTVG

Recently, we had some problems with an unstable HACMP cluster.

An engineer from IBM performed a Health Check and we made some changes according to his recommendations.

One thing he did not mentioned as a potential problem was the fact that the time on both nodes was not synchronized because of a bad xntp configuration. The difference between the two nodes was almost 10 secondes.

I fixed it myself, but I am not sure if he overlooked this issue or that a different systemtime on two HACMP nodes is not a problem at all.

Is there somebody who can give me an answer on this?

Thanks in advance.

Regards,
Frank

imho - a 10 second difference is not an issue. The only place where time might be an issue is when a timestamp is generated for a volume group.

However, your application might not have liked a 10 second reversal of time.

In summary, it is good that you go it corrected, as I am only saying that 10 seconds is not likely to be an issue. Once you get above 30 seconds (opinion here, no hard facts !  8)) you are getting into a more risky situation.

One way - say the poor mans way - to sync time over several systems is to run the AIX command setclock - and choose a common reference. I used to do this in classrooms because students would, by design, change the clock settings (exercise with the date command) and sometimes the year or month would be incorrect.