Is IRLM shutdown needed ?

teldb2kals

Is IRLM shutdown needed ?
Hi,

Our test DB2 subsystems are brought down and restarted on a weekly basis
for some storage housekeeping. Is it necessary to shutdown the
corresponding IRLM address space as well, or can we leave that running
during the subsystem shutdown ?

Thanks,

Regards,
Kals

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Jim Tonchick

Re: Is IRLM shutdown needed ?
(in response to teldb2kals)

First, most configurations let the DB2 subsystem manage the matching IRLM task, so it is started and stopped by DB2 with the subsystem. Yes, you can leave it active, but you said that you are performing storage housekeeping. The IRLM does all of its work in storage, mostly above the line (PC=YES). Very few shops still configure the IRLM using CSA storage (PC=NO).

The ony reason to leave an IRLM subsystem active while a single DB2 subsystem is shutdown is if the IRLM is used by multiple database subsystems, DB2 or IMS. Some shops configure just one IRLM for all test databases and one for production or even one per lpar. In this case, the IRLM must stay active to continue to provide locking services for all the databases that use it.

Jim Tonchick

-----Original Message-----
From: Teldb2kals <[login to unmask email]>
To: [login to unmask email]
Sent: Fri, Dec 18, 2009 11:04 am
Subject: [DB2-L] Is IRLM shutdown needed ?


Hi,
Our test DB2 subsystems are brought down and restarted on a weekly basis
or some storage housekeeping. Is it necessary to shutdown the
orresponding IRLM address space as well, or can we leave that running
uring the subsystem shutdown ?
Thanks,
Regards,
als
_____________________________________________________________________
* IDUG North America * Tampa, Florida, * May 10-14 2010 * http://IDUG.ORG/NA *
____________________________________________________________________
http://www.IDUG.org membership is now free.
o you have people in your office who are not an IDUG member?
how them how to access the information and help train the next generation of
B2 Users!
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If you need to change settings, http://www.idug.org/cgi-bin/wa?A0=DB2-L is the
ome of IDUG's DB2-L


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Wayne Driscoll

Re: Is IRLM shutdown needed ?
(in response to Jim Tonchick)
Jim,
I may be wrong but IIRC the only version of IRLM supported for DB2 (V8 and
above) ignores PC=NO and always uses private storage, and also no longer
supports a single IRLM for multiple subsystems.

=======================
Wayne Driscoll
OMEGAMON DB2 L3 Support/Development
wdrisco(AT)us.ibm.com
=======================



From:
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To:
[login to unmask email]
Date:
12/20/2009 12:12 PM
Subject:
Re: [DB2-L] Is IRLM shutdown needed ?
Sent by:
IDUG DB2-L <[login to unmask email]>



First, most configurations let the DB2 subsystem manage the matching IRLM
task, so it is started and stopped by DB2 with the subsystem. Yes, you
can leave it active, but you said that you are performing storage
housekeeping. The IRLM does all of its work in storage, mostly above the
line (PC=YES). Very few shops still configure the IRLM using CSA storage
(PC=NO).

The ony reason to leave an IRLM subsystem active while a single DB2
subsystem is shutdown is if the IRLM is used by multiple database
subsystems, DB2 or IMS. Some shops configure just one IRLM for all test
databases and one for production or even one per lpar. In this case, the
IRLM must stay active to continue to provide locking services for all the
databases that use it.

Jim Tonchick
-----Original Message-----
From: Teldb2kals <[login to unmask email]>
To: [login to unmask email]
Sent: Fri, Dec 18, 2009 11:04 am
Subject: [DB2-L] Is IRLM shutdown needed ?

Hi,

Our test DB2 subsystems are brought down and restarted on a weekly basis
for some storage housekeeping. Is it necessary to shutdown the
corresponding IRLM address space as well, or can we leave that running
during the subsystem shutdown ?

Thanks,

Regards,
Kals

_____________________________________________________________________

* IDUG North America * Tampa, Florida, * May 10-14 2010 *
http://IDUG.ORG/NA *
_____________________________________________________________________

http://www.IDUG.org membership is now free.
Do you have people in your office who are not an IDUG member?
Show them how to access the information and help train the next generation
of
DB2 Users!
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the
home of IDUG's DB2-L




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