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| sebastia |
 Posted: Thu Jan 01, 2009 9:33 am Post subject: MAXINST versus MAXINSTC (mq v7) |
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Grand Master
Joined: 07 Oct 2004
Posts: 1003
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MAXINST
Specifies the maximum number of simultaneous instances of a server-connection channel that can be started.
MAXINSTC
Specifies the maximum number of simultaneous instances of a server-connection channel that can be started from a single client.
My question is :
what is the meaning of "from a single client" ?
The same IP ?
To clarify : I set MAXINST=6 and MAXINSTC=3
Then, from 3 to 6 clients shall be able to start a SVRCONN connection,
none of them with more than 2 simultaneous.
Am I right ? |
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| fjb_saper |
| Posted: Thu Jan 01, 2009 12:57 pm Post subject: Re: MAXINST versus MAXINSTC (mq v7) |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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| sebastia wrote: |
MAXINST
Specifies the maximum number of simultaneous instances of a server-connection channel that can be started.
MAXINSTC
Specifies the maximum number of simultaneous instances of a server-connection channel that can be started from a single client.
My question is :
what is the meaning of "from a single client" ?
The same IP ?
To clarify : I set MAXINST=6 and MAXINSTC=3
Then, from 3 to 6 clients shall be able to start a SVRCONN connection,
none of them with more than 2 simultaneous.
Am I right ? |
From 0 to 6 clients shall be able to start a SVRCONN connection, at any which time none of them can have more than 3 simultaneous instances, or any of them can have up to 3 simultaneous instances...
So if you have 2 clients each with 3 instances you cannot start a 3rd on on this channel as you have already a total of 6 (2 times 3).
Have fun 
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| sebastia |
| Posted: Thu Jan 01, 2009 1:24 pm Post subject: |
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Grand Master
Joined: 07 Oct 2004
Posts: 1003
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Well - seems I understood the sentences properly
but planned the test in a wrong situation.
mr Saper - ONE CLIENT MEANS ONE IP ?
Because maybe there are 4 channels between
MQ Server A... and MQ Client B ...
Stop ! It seems logical to me that those values (MAXINST & MAXINSTC)
are valid (or diferent) FOR EVERY CHANNEL, isn't it ?
I mean there is no accumulation of all the channels a Client has opened ...
Am I right ? |
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| fjb_saper |
| Posted: Thu Jan 01, 2009 4:13 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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I would expect to look at different client = different conname. However I would expect each instance of the same client to count towards MAXINST.
So let's look at it
MAXCHANNELS total of channels (include all types)
MAXACTIVECHANNELS total of active channels (includes all types)
SVRCONN only
MAXINST total of instances accross all clients (conname) of a specific channel
MAXINSTC total of instances for a specific channel for a specific client (conname)
(see special note for ZOS & CAF)
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| sebastia |
| Posted: Fri Jan 02, 2009 2:38 am Post subject: |
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Grand Master
Joined: 07 Oct 2004
Posts: 1003
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OK - I shall test it the week starting Jan, 12 (in Europe, ( )
Thanks a lot. |
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| sebastia |
| Posted: Fri Jan 02, 2009 4:05 am Post subject: |
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Grand Master
Joined: 07 Oct 2004
Posts: 1003
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mr Saper - I supose by "z/OS special note" you mean
+++
Note that on z/OS, without the Client Attachment feature installed, only a maximum of five instances are allowed on the channel named SYSTEM.ADMIN.SVRCONN. If MAXINST is set to a larger number than five, it is interpreted as zero without the CAF installed.
+++
But in my country, the z/OS specialists are so jelaous of their work and knowledge that they never allow me to use a keyboard against z/OS.
Which has bad meanings and also good ones ...
Ciao. Seb. |
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| sebastia |
| Posted: Fri Jan 02, 2009 4:24 am Post subject: |
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Grand Master
Joined: 07 Oct 2004
Posts: 1003
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Well, well - I am reading a bit more,
and can clarify a bit about "same client" ...
page 191, SC34-6941-00, MQ v7, "Clients" :
MAXINSTC(integer)
The maximum number of simultaneous individual server-connection channels that can be started from a single client.
>>> In this context,
>>> connections that originate from the same remote network address
>>> are regarded as coming from the same client.
So I understand
MAXINST is the limit at "destination" side of the SVRCONN tube,
and
MAXINSTC is the limit at "origin" side of the SVRCONN tube.
Don't hesitate to correct me if I am wrong !
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