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| A CLUSSDR performance suddenly drops during busy traffic. |
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| issac |
 Posted: Tue Jul 27, 2021 6:22 pm Post subject: A CLUSSDR performance suddenly drops during busy traffic. |
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Disciple
Joined: 02 Oct 2008
Posts: 158
Location: Shanghai
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Hello, there
The communication is between 2 QMGRs in a cluster. GW5 is a gateway and APP4 is a cluster member. The channel is TO.APP4, which sends data from GW5 to APP4.
The network traffic is quite busy. At a certain timepoint, GW5 suddenly starts sending only 1 packet every 5 seconds to APP4. GW5 is on AIX, and APP4 is on Linux. Packet size is also fixed to 133, when the usual packet size is 1514. The data being sent is actually correct.
Messages started piling up in GW5's S.C.T.Q. I suspended APP4 and solved the problem. No FDC nor QMGR error was observed during the occurrence.
What do you think is likely to be happening here?
Thank you!
Song
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| hughson |
| Posted: Wed Jul 28, 2021 1:14 am Post subject: Re: A CLUSSDR performance suddenly drops during busy traffic |
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Padawan
Joined: 09 May 2013
Posts: 1959
Location: Bay of Plenty, New Zealand
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| issac wrote: |
The network traffic is quite busy. At a certain timepoint, GW5 suddenly starts sending only 1 packet every 5 seconds to APP4. GW5 is on AIX, and APP4 is on Linux. Packet size is also fixed to 133, when the usual packet size is 1514. The data being sent is actually correct.
What do you think is likely to be happening here? |
Sounds like a network issue.
MQ is, obviously, very reliant on the network it runs on top of. If the network slows down as you describe, so does MQ. No magic, it can't deliver without the network.
What do your network people tell you?
Cheers,
Morag
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Morag Hughson @MoragHughson
IBM MQ Technical Education Specialist
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| bruce2359 |
| Posted: Wed Jul 28, 2021 6:39 am Post subject: Re: A CLUSSDR performance suddenly drops during busy traffic |
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Poobah
Joined: 05 Jan 2008
Posts: 9469
Location: US: west coast, almost. Otherwise, enroute.
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| hughson wrote: |
What do your network people tell you?
Cheers,
Morag |
Oooh, oooh! I know the answer to this one.
The network people will say that there are no issues in the network.
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I like deadlines. I like to wave as they pass by.
ב''ה
Lex Orandi, Lex Credendi, Lex Vivendi. As we Worship, So we Believe, So we Live. |
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| issac |
| Posted: Mon Aug 02, 2021 2:17 pm Post subject: |
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Disciple
Joined: 02 Oct 2008
Posts: 158
Location: Shanghai
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My network people say there's no issue in network.  Probably they're right as I don't observe a lot of packet retransmission. I'm involving OS administrators in the investigation.
Despite the slow pace I believe the analysis effort is on the right path.
Thanks for the help!
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| bruce2359 |
| Posted: Mon Aug 02, 2021 6:21 pm Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9469
Location: US: west coast, almost. Otherwise, enroute.
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I’ll speculate (‘guess’ at consultant wages) that you have a misbehaving NIC card. Swap NICs out to see if any improvement. Back in the day one case of NICs deployed slowly across a large metropolitan campus proved to be defective. Help desk noticed the coincidence.
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I like deadlines. I like to wave as they pass by.
ב''ה
Lex Orandi, Lex Credendi, Lex Vivendi. As we Worship, So we Believe, So we Live. |
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| Andyh |
| Posted: Tue Aug 03, 2021 2:35 am Post subject: |
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Master
Joined: 29 Jul 2010
Posts: 239
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What was the reason for pursuing this as a network issue with so little information on what MQ is doing ?
For example, is the channel substate constant during the issue, and if so what is that substate ?
A selective MQ trace, of each end of the troublesome channel would go a long way to showing what is going on. |
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