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| bay hoe san |
 Posted: Thu Apr 05, 2007 2:12 am Post subject: Cold & Warm start - Queue Manager |
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Centurion
Joined: 27 Nov 2006
Posts: 117
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Hello,
( 1) May I know what's the difference between hot and cold start of queue manager?
( 2) What command to issue to do a cold start of queue manager?
( 3) What command to issue to do a warm start of queue manager?
Pls enlighten.
Thank you.
.Hoe San. |
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| Vitor |
| Posted: Thu Apr 05, 2007 2:14 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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Where have you seen the terms "cold start" and "warm start"?
Typically they're used in the z/OS world, but I'm not familar with them being used to describe queue manager operations... 
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| bay hoe san |
| Posted: Thu Apr 05, 2007 2:28 am Post subject: |
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Centurion
Joined: 27 Nov 2006
Posts: 117
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Hello,
( 1) In chapter 3 pg 63 of the websphere mq z/os v6 system setup guide. If I am not mistaken, others manual also mention warm start.
Thanks.
.Hoe San. |
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| Vitor |
| Posted: Thu Apr 05, 2007 2:41 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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That reference simply says "don't cold start". I can't find a reference to warm start in that or the system admin guide. Nor can I find any other references to cold starting in the system admin guide except in the section on reinitializing a queue manager.
On that basis and with that in mind:
A "warm start" of a z/OS component is broadly the equivalent of a bounce on a distributed platform (endmqm / strmqm). Note that not all components actually stop, some simply return to a starting position (sometime called "lukewarm"  );
A "cold start" is a full restart from a given position (dltmqm / crtmqm). Depending on component, it can be a START command with a parameter or as seems to be the case here a series of JCL actions.
For instance, components will be warm started once a week as part of a backup cycle and cold started once a quarter as part of a maintenance cycle. This depends on the views of the individual sys prog, who typically view cold starting with some suspicion.
My experience of MQ is this environment is that the queue manager is warm started implicitally when it's associated CICS system is warm started. I've never cold started a z/OS queue manager.
Hope that helps.
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| tleichen |
| Posted: Thu Apr 05, 2007 5:57 am Post subject: |
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Yatiri
Joined: 11 Apr 2005
Posts: 663
Location: Center of the USA
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The terms "cold start" and "warm start" usually apply to the operating system, not to MQSeries. A cold start is when the system has been brought down to a halted state. No tasks are active in the machine. Then the o/s is brought up again. Some systems refer to this more commonly as a reboot.
A warm start is a reinitialization of the operating system without shutting the system down to a halted state, i.e., certain system tasks remain active throughout the reinitialization process. 
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| Vitor |
| Posted: Thu Apr 05, 2007 6:13 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| tleichen wrote: |
| The terms "cold start" and "warm start" usually apply to the operating system, not to MQSeries. |
Agreed, but I've heard the same terms applied to CICS & DB2. The z/OS System Admin manual also has a process for reinitializing a queue manager, which it refers to as a "cold start".
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| tleichen |
| Posted: Thu Apr 05, 2007 7:14 pm Post subject: |
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Yatiri
Joined: 11 Apr 2005
Posts: 663
Location: Center of the USA
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That's true.
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