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MQSeries.net Forum IndexGeneral IBM MQ SupportDoes MQ care if each end of a channel have different dates?

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zpat
PostPosted: Tue Feb 13, 2018 2:11 am Post subject: Does MQ care if each end of a channel have different dates? Reply with quote

Jedi Council

Joined: 19 May 2001
Posts: 5650
Location: UK

If we have host A - where the system date has been set back 2 months for testing purposes and host B where the system date is current.

If a sender channel connects A to B - does MQ care about the difference in system dates?

Getting some "in doubt" channel status which might be related to this.

A = Linux 7.1.0.8, B = AIX 7.1.0.7
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Well, I don't think there is any question about it. It can only be attributable to human error. This sort of thing has cropped up before, and it has always been due to human error.
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fjb_saper
PostPosted: Tue Feb 13, 2018 5:42 am Post subject: Re: Does MQ care if each end of a channel have different dat Reply with quote

Grand Poobah

Joined: 18 Nov 2003
Posts: 19727
Location: LI,NY

zpat wrote:
If we have host A - where the system date has been set back 2 months for testing purposes and host B where the system date is current.

If a sender channel connects A to B - does MQ care about the difference in system dates?

Getting some "in doubt" channel status which might be related to this.

A = Linux 7.1.0.8, B = AIX 7.1.0.7

Did you follow the "in doubt" check list and what did you find out?
Are you sure the system date was the only thing that's been set back?
What about application state??
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zpat
PostPosted: Tue Feb 13, 2018 5:50 am Post subject: Reply with quote

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Joined: 19 May 2001
Posts: 5650
Location: UK

A colleague of mine resolved the channel with backout.

Just wondered as a general point about dates, on another channel I saw a SSL issue with a certificate not valid on the earlier date...
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Well, I don't think there is any question about it. It can only be attributable to human error. This sort of thing has cropped up before, and it has always been due to human error.
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PeterPotkay
PostPosted: Tue Feb 13, 2018 6:05 am Post subject: Reply with quote

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Joined: 15 May 2001
Posts: 7454

Interesting question. Aside from the SSL Certificate Validity Dates you mentioned, I would guess the dates do not matter, but hope our resident channel expert Mr. Paul Clarke offers his opinion. Exits may care depending on what they do and how they do it.
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Peter Potkay
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PaulClarke
PostPosted: Tue Feb 13, 2018 11:46 am Post subject: Reply with quote

Guardian

Joined: 17 Nov 2005
Posts: 902
Location: New Zealand

MQ does not require synchronised clocks although, needless to say, the accuracy of all the myriad of dates and times in MQ does ultimately depend on how good your clock is.

At the end of the day though I suspect no two machines connected by an MQ channel are ever truly synchronised. It would make life very awkward if MQ was to require it,

Regards,

Paul.
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Paul Clarke
MQGem Software
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