| |
|
RSS Feed - WebSphere MQ Support
|
RSS Feed - Message Broker Support
|
| How to solve message retry delays impacting others |
« View previous topic :: View next topic » |
| Author |
Message
|
| bruce2359 |
 Posted: Tue Sep 29, 2020 3:58 am Post subject: |
 |
|
Poobah
Joined: 05 Jan 2008
Posts: 9469
Location: US: west coast, almost. Otherwise, enroute.
|
| zpat wrote: |
Getting off topic but setting channel maxlength to 100 MB can seriously consume CHIN storage on z/OS.
As this queue of ours is QSG shared, the CF (real) storage has to be available and that's quite expensive compared to standard disk (which I would agree is always worth over allocating than having to deal with queue full conditions).
Most of our critical queues are on z/OS and MQ on z/OS is many times more difficult and inconvenient to administer than distributed MQ as you have to worry about CF size, page set size, SMDS size, buffer pool size, CHIN region size and all the other joys of "Ye Olde" MVS. |
Earlier, you indicated that there is only one consumer app for the arriving messages. The usual configuration in Parallel Sysplex is to have multiple z/OS images, each capable and participating of processing the same incoming workload. Quite literally, each concurrent consuming app MQGETting from the shared queue.
Did I misunderstand? Is the CF-resident queue really shared across multiple z/OS consumer images? Does the consuming app exist across all of the z/OS images? How many z/OS's are in the QSG?
| zpat wrote: |
| Getting off topic but setting channel maxlength to 100 MB can seriously consume CHIN storage on z/OS. |
Well, OK; but CHIN address space storage is the virtual kind, and there's plenty of it. What is REGION or MEMLIMIT? Is the CHIN experiencing excessive paging, for example?
_________________
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 |
|
 |
| zpat |
| Posted: Tue Sep 29, 2020 6:02 am Post subject: Q |
|
|
Jedi Council
Joined: 19 May 2001
Posts: 5866
Location: UK
|
CHIN storage is quite a limiting factor for us with many MQ clients connecting to z/OS directly, but it is another subject.
The four way QSG does only have one (MQ client based) consumer for this application - they are using the QSG as a HA QM, they connect using the sysplex VIPA and will get connected to one of the QSG members to access their queue.
Ideally there would be a consumer per QSG member, or at least more than one in total but it's not the case at the present time. The consumer is not hosted on z/OS, it uses a MQ client connection from an off-mainframe host.
_________________
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. |
|
| Back to top |
|
|
| bruce2359 |
| Posted: Tue Sep 29, 2020 9:01 am Post subject: Re: Q |
|
|
Poobah
Joined: 05 Jan 2008
Posts: 9469
Location: US: west coast, almost. Otherwise, enroute.
|
| zpat wrote: |
| Ideally there would be a consumer per QSG member, or at least more than one in total but it's not the case at the present time. The consumer is not hosted on z/OS, it uses a MQ client connection from an off-mainframe host. |
Seriously? You/your mgt are expecting one sluggish midrange consuming app to keep up with a blistering fast z platform? David vs. Goliath.
_________________
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 |
|
|
| zpat |
| Posted: Wed Sep 30, 2020 4:16 am Post subject: |
|
|
Jedi Council
Joined: 19 May 2001
Posts: 5866
Location: UK
|
When it (the off mainframe app) works it does keep the queue depth mostly at zero.
But yes I was tempted to use an analogy like a Roll-Royce hitched to a Moped.
_________________
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. |
|
| Back to top |
|
|
| bruce2359 |
| Posted: Wed Sep 30, 2020 6:25 am Post subject: |
|
|
Poobah
Joined: 05 Jan 2008
Posts: 9469
Location: US: west coast, almost. Otherwise, enroute.
|
Why is the word ‘anal’ in ‘analogy?’
_________________
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 |
|
|
|
|
|
|
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
|
|
|
|
