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| hmh |
 Posted: Mon Mar 09, 2009 3:41 am Post subject: reduce logfiles of QMGR |
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Apprentice
Joined: 31 Mar 2006
Posts: 29
Location: Germany
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Hello, it is possible to change (reduce) the size and the nunmber of logfiles online, this means without dltmqm and crtmqm of the QMGR.
MQ Version is 6.0.2.5 on Solaris 10
actual qm.ini:
Log:
LogPrimaryFiles=128
LogSecondaryFiles=16
LogFilePages=4096
LogType=CIRCULAR
LogBufferPages=0
wanted values ov qm.ini
LogPrimaryFiles=3
LogSecondaryFiles=2
LogFilePages=1024
LogType=CIRCULAR
LogBufferPages=0
Does MQ also delete the not longer needed files in the filesystem?
Kind regards
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Michael Hoppe
63067 Offenbach
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| Vitor |
| Posted: Mon Mar 09, 2009 3:53 am Post subject: Re: reduce logfiles of QMGR |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| hmh wrote: |
| Does MQ also delete the not longer needed files in the filesystem? |
Only the secondary ones if they're not needed.
There is an unsupported hack to increase the number of logs for a circular logged queue manager. I would be wary of using it to reduce the number of logs.
I'd also question why you're bothering to reduce the number of logs. Too much log won't cause the queue manager a problem in the way too little log will. And disc is cheap.
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Insanity is the best defence. |
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| hmh |
| Posted: Mon Mar 09, 2009 4:31 am Post subject: |
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Apprentice
Joined: 31 Mar 2006
Posts: 29
Location: Germany
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Clear, but I don't need definitively not so much logfiles.
I see that since september 2007 only 5 Logfiles are used by the application and I need the filespace for other QMGR's.
The problem is, that I can't make a dltmqm and crtmqm on the fly, because this is an productive system of a financial order and trading system.
A small one, really, but actually I won't get the risk that it will not work any longer after doing this.
Any other Idea?
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Michael Hoppe
63067 Offenbach
+49 (0)170 / 9629 131
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| Vitor |
| Posted: Mon Mar 09, 2009 4:37 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| hmh wrote: |
The problem is, that I can't make a dltmqm and crtmqm on the fly, because this is an productive system of a financial order and trading system.
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Do not be doing unsupported hacks on production systems of any size.
Get a maintenance window, resize the queue manager properly with dltmqm & crtmqm.
Or buy more disc for the new queue managers. Disc is cheap. 
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| mqjeff |
| Posted: Mon Mar 09, 2009 4:50 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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You can change the *number* of log files without using dltmqm/crtmqm - just edit the qm.ini.
You will still need a maintenance window because you must still endmqm/strmqm for it to take effect. |
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| hmh |
| Posted: Mon Mar 09, 2009 5:44 am Post subject: |
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Apprentice
Joined: 31 Mar 2006
Posts: 29
Location: Germany
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| mqjeff wrote: |
You can change the *number* of log files without using dltmqm/crtmqm - just edit the qm.ini.
You will still need a maintenance window because you must still endmqm/strmqm for it to take effect. |
Thank, but this I tested on one of our Test-System.
Getting a downtime for some time to restart teh QMGR isn't the problem.
Changing the qm.ini isn't also possible during regular working time, but this doesn't delete the not longer needed logfiles.
Can I delete the Logfiles in the active directory manually or will this result in other problems?
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Michael Hoppe
63067 Offenbach
+49 (0)170 / 9629 131
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| exerk |
| Posted: Mon Mar 09, 2009 5:49 am Post subject: |
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Jedi Council
Joined: 02 Nov 2006
Posts: 6339
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Do NOT delete the log files manually - EVER. You can edit the qm.ini file at any time, but the changes will not be picked up until restart of the queue manager. As you have stated that is no problem, do as suggested.
EDIT: shot from the lip again...I meant until the changes had been made and the queue manager restarted 
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Last edited by exerk on Mon Mar 09, 2009 5:51 am; edited 1 time in total |
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| Vitor |
| Posted: Mon Mar 09, 2009 5:49 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| hmh wrote: |
| Can I delete the Logfiles in the active directory manually or will this result in other problems? |
Only once qm.ini has been edited and the queue manager restarted.
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| hmh |
| Posted: Mon Mar 09, 2009 6:34 am Post subject: |
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Apprentice
Joined: 31 Mar 2006
Posts: 29
Location: Germany
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| exerk wrote: |
| EDIT: shot from the lip again...I meant until the changes had been made and the queue manager restarted |
Looks like, that I have no other chance as dltmqm and crtmqm.
I do the following.
create a QMGR with
crtmqm -lc -lf 4096 -lp 128 -ls 16 QMGR
strmqm QMGR
endmqm -i QMGR
edit the qm.ini and change the values to:
Log:
LogPrimaryFiles=3
LogSecondaryFiles=2
LogFilePages=1024
LogType=CIRCULAR
strmqm QMGR
endmqm -i QMGR
until here everthing works fine
delete the logliles except S0000000.LOG S0000001.LOG S0000002.LOG
strmqm QMGR results in the error....
$ strmqm QMGR
WebSphere MQ queue manager 'QMGR' starting.
AMQ7017: Log not available.
MQ-Version is 6.0.2.1, sorry for the mistake.....
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Michael Hoppe
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| exerk |
| Posted: Mon Mar 09, 2009 6:44 am Post subject: |
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Jedi Council
Joined: 02 Nov 2006
Posts: 6339
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Did you delete all the log files before restarting?
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It's puzzling, I don't think I've ever seen anything quite like this before...and it's hard to soar like an eagle when you're surrounded by turkeys. |
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| hmh |
| Posted: Mon Mar 09, 2009 7:17 am Post subject: |
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Apprentice
Joined: 31 Mar 2006
Posts: 29
Location: Germany
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| exerk wrote: |
| Did you delete all the log files before restarting? |
No, not all.
I stop the QMGR
delete all files, except the first three.
The Logs S0000000.LOG S0000001.LOG S0000002.LOG I don't touch ....
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Michael Hoppe
63067 Offenbach
+49 (0)170 / 9629 131
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| exerk |
| Posted: Mon Mar 09, 2009 7:38 am Post subject: |
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Jedi Council
Joined: 02 Nov 2006
Posts: 6339
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OK, I did this on Windows XP SP3, WMQ 7.0.0.1:
1. I created a queue manager with -lp 10 -ls 10 and started/stopped it.
2. I changed the logs to -lp 5 -ls 5 and started it.
3. I tried deleting logs 5 to 9 and couldn't.
4. I stopped the queue manager, then I could delete the 'redundant' log files.
5. On restart I got 'AMQ7017: Log not available.'
As I did not run anything into the queue manager to generate log activity, I am somewhat confused as like mqjeff I thought the number of logs could be increased/reduced as necessary.
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It's puzzling, I don't think I've ever seen anything quite like this before...and it's hard to soar like an eagle when you're surrounded by turkeys. |
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| hmh |
| Posted: Mon Mar 09, 2009 7:57 am Post subject: |
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Apprentice
Joined: 31 Mar 2006
Posts: 29
Location: Germany
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| exerk wrote: |
| As I did not run anything into the queue manager to generate log activity, I am somewhat confused as like mqjeff I thought the number of logs could be increased/reduced as necessary. |
I'm confused too.
Maybe there must be another link in MQ. tha the QMGR expect more Logfiles than in the qm.ini defined.
I knew, thai in MQ 5.3.X you only can define more logfiles than before, but you can't reduce ....
Try to do this with dltmqm and crtmqm.
Thanks for help and some ideas.....
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Michael Hoppe
63067 Offenbach
+49 (0)170 / 9629 131
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| bruce2359 |
| Posted: Mon Mar 09, 2009 9:25 am Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9469
Location: US: west coast, almost. Otherwise, enroute.
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| Quote: |
| 4. I stopped the queue manager, then I could delete the 'redundant' log files. |
At this point, the qmgr has released its enque on these files.
| Quote: |
| 5. On restart I got 'AMQ7017: Log not available.' |
The qmgr knows which logs files it needs, wants, owns, from the checkpoint file (this from the dark recesses of my memory).
| Quote: |
| As I did not run anything into the queue manager to generate log activity... |
Starting a qmgr creates log entries.
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| exerk |
| Posted: Mon Mar 09, 2009 1:30 pm Post subject: |
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Jedi Council
Joined: 02 Nov 2006
Posts: 6339
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| bruce2359 wrote: |
| Quote: |
| 4. I stopped the queue manager, then I could delete the 'redundant' log files. |
At this point, the qmgr has released its enque on these files. |
As expected. I did it expecting this, filemon showed the files in use by WMQ, and it was to forestall any 'did you try...' questions.
| bruce2359 wrote: |
| Quote: |
| 5. On restart I got 'AMQ7017: Log not available.' |
The qmgr knows which logs files it needs, wants, owns, from the checkpoint file (this from the dark recesses of my memory). |
Again, as expected. It was the 'missing', i.e. deleted files about which it was complaining.
| bruce2359 wrote: |
| Quote: |
| As I did not run anything into the queue manager to generate log activity... |
Starting a qmgr creates log entries. |
By that I meant I did not induce any check-pointing to roll anything into the logs, e.g. long running UOW's.
So, hence my confusion, especially having checked the Info Centre, which states:
| Quote: |
| The value is examined when the queue manager is created or started. You can change it after the queue manager has been created. However, a change in the value is not effective until the queue manager is restarted, and the effect might not be immediate. |
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It's puzzling, I don't think I've ever seen anything quite like this before...and it's hard to soar like an eagle when you're surrounded by turkeys. |
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