ASG
IBM
Zystems
Cressida
Icon
Netflexity
 
  MQSeries.net
Search  Search       Tech Exchange      Education      Certifications      Library      Info Center      SupportPacs      LinkedIn  Search  Search                                                                   FAQ  FAQ   Usergroups  Usergroups
 
Register  ::  Log in Log in to check your private messages
 
RSS Feed - WebSphere MQ Support RSS Feed - Message Broker Support

MQSeries.net Forum Index » General IBM MQ Support » A CLUSSDR performance suddenly drops during busy traffic.

Post new topic  Reply to topic
 A CLUSSDR performance suddenly drops during busy traffic. « View previous topic :: View next topic » 
Author Message
issac
PostPosted: Tue Jul 27, 2021 6:22 pm    Post subject: A CLUSSDR performance suddenly drops during busy traffic. Reply with quote

Disciple

Joined: 02 Oct 2008
Posts: 158
Location: Shanghai

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



_________________
Bazinga!
Back to top
View user's profile Send private message
hughson
PostPosted: Wed Jul 28, 2021 1:14 am    Post subject: Re: A CLUSSDR performance suddenly drops during busy traffic Reply with quote

Padawan

Joined: 09 May 2013
Posts: 1914
Location: Bay of Plenty, New Zealand

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
_________________
Morag Hughson @MoragHughson
IBM MQ Technical Education Specialist
Get your IBM MQ training here!
MQGem Software
Back to top
View user's profile Send private message Visit poster's website
bruce2359
PostPosted: Wed Jul 28, 2021 6:39 am    Post subject: Re: A CLUSSDR performance suddenly drops during busy traffic Reply with quote

Poobah

Joined: 05 Jan 2008
Posts: 9394
Location: US: west coast, almost. Otherwise, enroute.

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.
_________________
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.
Back to top
View user's profile Send private message
issac
PostPosted: Mon Aug 02, 2021 2:17 pm    Post subject: Reply with quote

Disciple

Joined: 02 Oct 2008
Posts: 158
Location: Shanghai

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!
_________________
Bazinga!
Back to top
View user's profile Send private message
bruce2359
PostPosted: Mon Aug 02, 2021 6:21 pm    Post subject: Reply with quote

Poobah

Joined: 05 Jan 2008
Posts: 9394
Location: US: west coast, almost. Otherwise, enroute.

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.
_________________
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.
Back to top
View user's profile Send private message
Andyh
PostPosted: Tue Aug 03, 2021 2:35 am    Post subject: Reply with quote

Master

Joined: 29 Jul 2010
Posts: 237

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.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic  Reply to topic Page 1 of 1

MQSeries.net Forum Index » General IBM MQ Support » A CLUSSDR performance suddenly drops during busy traffic.
Jump to:  



You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
Protected by Anti-Spam ACP
 
 


Theme by Dustin Baccetti
Powered by phpBB © 2001, 2002 phpBB Group

Copyright © MQSeries.net. All rights reserved.