WLM Imp1
Hi, It's been recommended NOT to use Imp 1 in WLM. My client has been using Imp1 for online CICS. I’m planning to change it to use Imp2 buy changing all Imp to Imp+1. Can you think of any potential problems/issues? TIA, Rez -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: WLM Imp1
R Hey sys...@yahoo.com wrote in message news:listserv%200911240223161599.0...@bama.ua.edu... Hi, It's been recommended NOT to use Imp 1 in WLM. My client has been using Imp1 for online CICS. I'm planning to change it to use Imp2 buy changing all Imp to Imp+1. Can you think of any potential problems/issues? TIA, Rez Why/where is it recommended not to use IMP=1? All IMPs are relative, shifting them all will have no influence. You don't have any IMP=5? Kees. ** For information, services and offers, please visit our web site: http://www.klm.com. This e-mail and any attachment may contain confidential and privileged material intended for the addressee only. If you are not the addressee, you are notified that no part of the e-mail or any attachment may be disclosed, copied or distributed, and that any other action related to this e-mail or attachment is strictly prohibited, and may be unlawful. If you have received this e-mail by error, please notify the sender immediately by return e-mail, and delete this message. Koninklijke Luchtvaart Maatschappij NV (KLM), its subsidiaries and/or its employees shall not be liable for the incorrect or incomplete transmission of this e-mail or any attachments, nor responsible for any delay in receipt. Koninklijke Luchtvaart Maatschappij N.V. (also known as KLM Royal Dutch Airlines) is registered in Amstelveen, The Netherlands, with registered number 33014286 ** -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: WLM Imp1
Further, most shops I know run with a fair amount of Importance 1. There're no indications they're wrong. So I'd like to understand where the No WLM Importance 1 advice came from. Thanks, Martin Martin Packer Performance Consultant IBM United Kingdom Ltd +44-20-8832-5167 +44-7802-245-584 email: martin_pac...@uk.ibm.com Twitter ID: MartinPacker One Tribe Y'all :-) Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: WLM Imp1
We are very happy with DB2 at Importance 1 and CICS at Importance 2. On Tue, Nov 24, 2009 at 11:10 AM, Martin Packer martin_pac...@uk.ibm.comwrote: Further, most shops I know run with a fair amount of Importance 1. There're no indications they're wrong. So I'd like to understand where the No WLM Importance 1 advice came from. Thanks, Martin Martin Packer Performance Consultant IBM United Kingdom Ltd +44-20-8832-5167 +44-7802-245-584 email: martin_pac...@uk.ibm.com Twitter ID: MartinPacker One Tribe Y'all :-) Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html -- Mike Shorkend m...@shorkend.com www.shorkend.com Tel: +972524208743 Fax: +97239772196 -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: WLM Imp1
It's been recommended NOT to use Imp 1 in WLM. By whom? My client has been using Imp1 for online CICS. As your client should be. I’m planning to change it to use Imp2 buy changing all Imp to Imp+1. Why? Can you think of any potential problems/issues? Yes! You are chopping out one level of importance for NO good reason. You are going to have to redistribute all your service classes (excluding SYSTEM, SYSSTC Discretionary) over four importance levels rather than five. This gives you less flexibility and there is NO reason for it. - Too busy driving to stop for gas! -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: WLM Imp1
Ted MacNEIL wrote: Can you think of any potential problems/issues? Yes! You are chopping out one level of importance for NO good reason. You are going to have to redistribute all your service classes (excluding SYSTEM, SYSSTC Discretionary) over four importance levels rather than five. This gives you less flexibility and there is NO reason for it. Interesting. Thanks for mentioning this. I will bookmark this. Too busy driving to stop for gas! Go slowww ;-D Groete / Greetings Elardus Engelbrecht -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: WLM Imp1
On Tue, 24 Nov 2009 09:10:34 +, Martin Packer martin_pac...@uk.ibm.com wrote: Further, most shops I know run with a fair amount of Importance 1. There're no indications they're wrong. So I'd like to understand where the No WLM Importance 1 advice came from. A well known performance expert used to recommend that. But it wasn't NO importance=1, it was that imp=1 should only be used or emergency work and your bread and butter application(s). So I understand where the recommendation comes from. 10-15 years ago I had a lot of consulting gigs doing WLM tuning (some were conversions to WLM). I would say the majority of shops I went into way overused IMP=1 and at the same time underused IMP=5. So I happen to agree with that basic philosophy. There is very little IMP=1 work here. WebSphere enclaves and the DB2 DDF period 1 enclaves that support the same core applications. Mark -- Mark Zelden Sr. Software and Systems Architect - z/OS Team Lead Zurich North America / Farmers Insurance Group - ZFUS G-ITO mailto:mark.zel...@zurichna.com z/OS Systems Programming expert at http://expertanswercenter.techtarget.com/ Mark's MVS Utilities: http://home.flash.net/~mzelden/mvsutil.html -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: WLM Imp1
R Hey wrote: It's been recommended NOT to use Imp 1 in WLM. By whom? -- Edward E Jaffe Phoenix Software International, Inc 5200 W Century Blvd, Suite 800 Los Angeles, CA 90045 310-338-0400 x318 edja...@phoenixsoftware.com http://www.phoenixsoftware.com/ -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: WLM Imp1
Mark Zelden wrote: A well known performance expert used to recommend that. But it wasn't NO importance=1, it was that imp=1 should only be used or emergency work and your bread and butter application(s). So I understand where the recommendation comes from. 10-15 years ago I had a lot of consulting gigs doing WLM tuning (some were conversions to WLM). I would say the majority of shops I went into way overused IMP=1 and at the same time underused IMP=5. So I happen to agree with that basic philosophy. There is very little IMP=1 work here. WebSphere enclaves and the DB2 DDF period 1 enclaves that support the same core applications. Methinks this might be a hold-over from the dark days prior to the introduction of the CPU- and STORAGE-critical attributes. Importance ranking is what WLM uses to choose resource donors. And, real storage was let plentiful than it is today. So, people used to try to protect working sets for loved ones by assigning a relatively high importance. It seems a bit misguided now. But, that was the only relevant adjustment available to them (other than switching back to compatibility mode). -- Edward E Jaffe Phoenix Software International, Inc 5200 W Century Blvd, Suite 800 Los Angeles, CA 90045 310-338-0400 x318 edja...@phoenixsoftware.com http://www.phoenixsoftware.com/ -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: WLM Imp1
On Tue, 24 Nov 2009 07:15:24 -0800, Edward Jaffe edja...@phoenixsoftware.com wrote: Mark Zelden wrote: A well known performance expert used to recommend that. But it wasn't NO importance=1, it was that imp=1 should only be used or emergency work and your bread and butter application(s). So I understand where the recommendation comes from. 10-15 years ago I had a lot of consulting gigs doing WLM tuning (some were conversions to WLM). I would say the majority of shops I went into way overused IMP=1 and at the same time underused IMP=5. So I happen to agree with that basic philosophy. There is very little IMP=1 work here. WebSphere enclaves and the DB2 DDF period 1 enclaves that support the same core applications. Methinks this might be a hold-over from the dark days prior to the introduction of the CPU- and STORAGE-critical attributes. Importance ranking is what WLM uses to choose resource donors. And, real storage was let plentiful than it is today. So, people used to try to protect working sets for loved ones by assigning a relatively high importance. It seems a bit misguided now. But, that was the only relevant adjustment available to them (other than switching back to compatibility mode). Some of that is probably true. But from my experience at a lot of shops, I think many of them just used IMP=1 for just about everything considered production online. All CICS regions, all DB2 subsystems, MQ, etc. Then they would (misguidedly) try and use velocity to make some distinction within that service class. For example - when trying to translate the compatibility mode model for putting a CICS TOR above AOR, they would make them both IMP=1 but use a higher velocity (and different service class) for the TOR regions or do the same thing to make DB2 higher than CICS. I guess we need Rez to give us some details behind the post. Mark -- Mark Zelden Sr. Software and Systems Architect - z/OS Team Lead Zurich North America / Farmers Insurance Group - ZFUS G-ITO mailto:mark.zel...@zurichna.com z/OS Systems Programming expert at http://expertanswercenter.techtarget.com/ Mark's MVS Utilities: http://home.flash.net/~mzelden/mvsutil.html -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: WLM Imp1
Personally, I would say that it depends. My last gig on a small 2-way I was standing on my head with the Policy to make it work due to capacity limitations. I had all kinds of stuff in IMP 1. Now I'm currently supporting a very large plex with many disparate sizes, shapes, workloads. Some LPARs have very little IMP 1 and others have a little more. As long as the the PI's are met and the clients are happy I go with what works. --- On Tue, 11/24/09, Mark Zelden mark.zel...@zurichna.com wrote: From: Mark Zelden mark.zel...@zurichna.com Subject: Re: WLM Imp1 To: IBM-MAIN@bama.ua.edu Date: Tuesday, November 24, 2009, 1:56 PM On Tue, 24 Nov 2009 09:10:34 +, Martin Packer martin_pac...@uk.ibm.com wrote: Further, most shops I know run with a fair amount of Importance 1. There're no indications they're wrong. So I'd like to understand where the No WLM Importance 1 advice came from. A well known performance expert used to recommend that. But it wasn't NO importance=1, it was that imp=1 should only be used or emergency work and your bread and butter application(s). So I understand where the recommendation comes from. 10-15 years ago I had a lot of consulting gigs doing WLM tuning (some were conversions to WLM). I would say the majority of shops I went into way overused IMP=1 and at the same time underused IMP=5. So I happen to agree with that basic philosophy. There is very little IMP=1 work here. WebSphere enclaves and the DB2 DDF period 1 enclaves that support the same core applications. Mark -- Mark Zelden Sr. Software and Systems Architect - z/OS Team Lead Zurich North America / Farmers Insurance Group - ZFUS G-ITO mailto:mark.zel...@zurichna.com z/OS Systems Programming expert at http://expertanswercenter.techtarget.com/ Mark's MVS Utilities: http://home.flash.net/~mzelden/mvsutil.html -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: WLM Imp1
On Tue, 24 Nov 2009 09:54:29 -0600, Mark Zelden mark.zel...@zurichna.com wrote: On Tue, 24 Nov 2009 07:15:24 -0800, Edward Jaffe edja...@phoenixsoftware.com wrote: Mark Zelden wrote: A well known performance expert used to recommend that. But it wasn't NO importance=1, it was that imp=1 should only be used or emergency work and your bread and butter application(s). So I understand where the recommendation comes from. 10-15 years ago I had a lot of consulting gigs doing WLM tuning (some were conversions to WLM). I would say the majority of shops I went into way overused IMP=1 and at the same time underused IMP=5. So I happen to agree with that basic philosophy. There is very little IMP=1 work here. WebSphere enclaves and the DB2 DDF period 1 enclaves that support the same core applications. Methinks this might be a hold-over from the dark days prior to the introduction of the CPU- and STORAGE-critical attributes. Importance ranking is what WLM uses to choose resource donors. And, real storage was let plentiful than it is today. So, people used to try to protect working sets for loved ones by assigning a relatively high importance. It seems a bit misguided now. But, that was the only relevant adjustment available to them (other than switching back to compatibility mode). Some of that is probably true. But from my experience at a lot of shops, I think many of them just used IMP=1 for just about everything considered production online. All CICS regions, all DB2 subsystems, MQ, etc. Then they would (misguidedly) try and use velocity to make some distinction within that service class. Sorry, I wrote that wrong. Change service class to importance level or workload in the sentence above. For example - when trying to translate the compatibility mode model for putting a CICS TOR above AOR, they would make them both IMP=1 but use a higher velocity (and different service class) for the TOR regions or do the same thing to make DB2 higher than CICS. I guess we need Rez to give us some details behind the post. -- Mark Zelden Sr. Software and Systems Architect - z/OS Team Lead Zurich North America / Farmers Insurance Group - ZFUS G-ITO mailto:mark.zel...@zurichna.com z/OS Systems Programming expert at http://expertanswercenter.techtarget.com/ Mark's MVS Utilities: http://home.flash.net/~mzelden/mvsutil.html -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: WLM Imp1
On Tue, 24 Nov 2009 07:57:34 -0800, Patrick Falcone patrick.falco...@verizon.net wrote: Personally, I would say that it depends. My last gig on a small 2-way I was standing on my head with the Policy to make it work due to capacity limitations. I had all kinds of stuff in IMP 1. That would be more of a problem on a small machine that is capacity challenged. If too much is IMP=1 and there are not enough cycles to go around, what's WLM to do (especially when you consider the SYSTEM and SYSSTC workloads)? Now I'm currently supporting a very large plex with many disparate sizes, shapes, workloads. Some LPARs have very little IMP 1 and others have a little more. As long as the the PI's are met and the clients are happy I go with what works. That is the bottom line - are SLAs being met. Mark -- Mark Zelden Sr. Software and Systems Architect - z/OS Team Lead Zurich North America / Farmers Insurance Group - ZFUS G-ITO mailto:mark.zel...@zurichna.com z/OS Systems Programming expert at http://expertanswercenter.techtarget.com/ Mark's MVS Utilities: http://home.flash.net/~mzelden/mvsutil.html -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: WLM Imp1
When I came here there was work defined in Imp1-3, and nothing in 4-Disc, and this is not the first time I;ve seen such things. Now the only thing I have in Imp 1 is STCHIGH, which includes the *DBM1, *MSTR, *DIST and other server address spaces, but no user work. Mark Zelden mark.zel...@zurichna.com 11/24/2009 8:56 AM On Tue, 24 Nov 2009 09:10:34 +, Martin Packer martin_pac...@uk.ibm.com wrote: A well known performance expert used to recommend that. But it wasn't NO importance=1, it was that imp=1 should only be used or emergency work and your bread and butter application(s). So I understand where the recommendation comes from. 10-15 years ago I had a lot of consulting gigs doing WLM tuning (some were conversions to WLM). I would say the majority of shops I went into way overused IMP=1 and at the same time underused IMP=5. So I happen to agree with that basic philosophy. There is very little IMP=1 work here. WebSphere enclaves and the DB2 DDF period 1 enclaves that support the same core applications. Mark -- Mark Zelden Sr. Software and Systems Architect - z/OS Team Lead Zurich North America / Farmers Insurance Group - ZFUS G-ITO mailto:mark.zel...@zurichna.com z/OS Systems Programming expert at http://expertanswercenter.techtarget.com/ Mark's MVS Utilities: http://home.flash.net/~mzelden/mvsutil.html -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html CONFIDENTIALITY/EMAIL NOTICE: The material in this transmission contains confidential and privileged information intended only for the addressee. If you are not the intended recipient, please be advised that you have received this material in error and that any forwarding, copying, printing, distribution, use or disclosure of the material is strictly prohibited. If you have received this material in error, please (i) do not read it, (ii) reply to the sender that you received the message in error, and (iii) erase or destroy the material. Emails are not secure and can be intercepted, amended, lost or destroyed, or contain viruses. You are deemed to have accepted these risks if you communicate with us by email. Thank you. -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: WLM Imp1
On Tue, 24 Nov 2009 02:23:16 -0600, R Hey sys...@yahoo.com wrote: Hi, It's been recommended NOT to use Imp 1 in WLM. My client has been using Imp1 for online CICS. Im planning to change it to use Imp2 buy changing all Imp to Imp+1. Can you think of any potential problems/issues? TIA, Rez -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html One thought here is that, when your management comes to you and says to increase priority (meaning throughput) of an IMP 1 address space, your only option will be to decrease the importance of all other IMP 1 address spaces. (It's not a matter of IF; it's a matter of WHEN!) A rather nasty undertaking! If you leave some room at the top, you will have room to increase the importance level of a single address space. This is not to say that you shouldn't have IMP 1 service classes; just leave a little wiggle room for when that time comes. -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: WLM Imp1
I see no technical reason to not put anything in importance 1. The only thing that matters is the relative importance. Importance 1 does not mean anything special. HOWEVER! I can see why you would not want to much there. If you put many of your important workloads in importance 1 and you found that one workload was extra special, then what do you do? I can understand designing around importance 2 to discretionary and then see what really has a strong business need for importance 1. This is one of those It Depends questions. There is no answer which is right for everyone. Just understand the implications and make your own decisions. Terry Draper zSeries Performance Consultant w...@btopenworld.com mobile: +966 556730876 --- On Tue, 24/11/09, R Hey sys...@yahoo.com wrote: From: R Hey sys...@yahoo.com Subject: WLM Imp1 To: IBM-MAIN@bama.ua.edu Date: Tuesday, 24 November, 2009, 8:23 Hi, It's been recommended NOT to use Imp 1 in WLM. My client has been using Imp1 for online CICS. I’m planning to change it to use Imp2 buy changing all Imp to Imp+1. Can you think of any potential problems/issues? TIA, Rez -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: WLM Imp1
It certainly depends on what you are trying to accomplish. That performance expert (who lives near me now) never said NO IMP=1; but rather reserve it for mission-critical work, short- important transactions, and emergency work. If you put a lot of work into IMP=1, there is no UP when you need to get something done in a hurry. If you look at at the IMP levels as a bell curve (or a slightly skewed to the right one), WLM seems to do well with a little bit of work in IMP=1, more in IMP=2, more to much more in IMP=3, more in IMP=4, and a little in IMP=5. Remember that WLM starts at IMP=1 to be sure that work gets done, and moves down to IMP=5 and DISC. And we're not going to start a war on whether there should or should not be DISC work. It is desirable that IMP=1 and 2 have a good PI, and the rest maybe, not so much. Also remember, the WLM robs Peter to pay Paul, so you really want work in all of the IMP levels. Of course, this is all IMHO, and your mileage will vary. This technique has worked in all the many sites that I've helped with WLM. znor...@ca.com -Original Message- From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On Behalf Of Edward Jaffe Sent: Tuesday, November 24, 2009 SYSN 07:07 AM To: IBM-MAIN@bama.ua.edu Subject: Re: WLM Imp1 R Hey wrote: It's been recommended NOT to use Imp 1 in WLM. By whom? -- Edward E Jaffe Phoenix Software International, Inc 5200 W Century Blvd, Suite 800 Los Angeles, CA 90045 310-338-0400 x318 edja...@phoenixsoftware.com http://www.phoenixsoftware.com/ -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: WLM Imp1
Some of that is probably true. But from my experience at a lot of shops, I think many of them just used IMP=1 for just about everything considered production online. All CICS regions, all DB2 subsystems, MQ, etc. Then they would (misguidedly) try and use velocity to make some distinction within that service class. I see nothing wrong with making Production Online all IMP=1, but there is no need to f*rt around with the velocities. The WLM is smart enough to figure out which sub-system is dependent on which. It just creates pseudo-classes to manage the dependencies. What is more important is the service levels! If they're being met, don't futz with it. If they aren't, fix it! Getting hung up on which importance should (not) be used is counter productive. - Too busy driving to stop for gas! -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: WLM Imp1
On Tue, 24 Nov 2009 19:05:59 +, Ted MacNEIL eamacn...@yahoo.ca wrote: I see nothing wrong with making Production Online all IMP=1, but there is no need to f*rt around with the velocities. The WLM is smart enough to figure out which sub-system is dependent on which. It just creates pseudo-classes to manage the dependencies. If you are referring to the dynamic internal service classes that WLM creates, those only apply to a server topology (like CICS and IMS with transaction goals). WLM has no way of knowing the inter-dependencies of other address spaces.And I'm pretty sure you have posted several times about not seeing a compelling reason to use CICS transaction goals (they were never implemented at my current employer either). Mark -- Mark Zelden Sr. Software and Systems Architect - z/OS Team Lead Zurich North America / Farmers Insurance Group - ZFUS G-ITO mailto:mark.zel...@zurichna.com z/OS Systems Programming expert at http://expertanswercenter.techtarget.com/ Mark's MVS Utilities: http://home.flash.net/~mzelden/mvsutil.html -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: WLM Imp1
If you are referring to the dynamic internal service classes that WLM creates, those only apply to a server topology (like CICS and IMS with transaction goals). WLM has no way of knowing the inter-dependencies of other address spaces. Yes. You're correct. If you need to exploit this, you MUST have transaction goals. And I'm pretty sure you have posted several times about not seeing a compelling reason to use CICS transaction goals (they were never implemented at my current employer either). The compelling reason is service levels. The last shop I worked at had sub-0.2 second response time with velocity goals. What was the point of introducing transaction goals? When I first implemented goal mode 10 years ago, I was gung-ho to transaction goals for CICS, IMS DDF. Now, chastised by reality, I realise one size does not fit all. Measure twice, cut once! (But, use all importance levels, effectively) - Too busy driving to stop for gas! -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: WLM Imp1
I would say the majority of shops I went into way overused IMP=1 and at the same time underused IMP=5. But from my experience at a lot of shops, I think many of them just used IMP=1 for just about everything considered production online. All CICS regions, all DB2 subsystems, MQ, etc. Then they would (misguidedly) try and use velocity to make some distinction within that service class. Have you been to our shop here, too, Mark? And did not come by my desk?!? vbg When I first defined the WLM policy here, I had it all spread out evenly. And then (since everyone knew we went to WLM mode) everyone looked at the system and started screaming once 'their' product had delays. Never mind that those delays would also have been there in compat mode! Never mind that the PI was still good. In the end I was forced to classify just about everyone (in our case IMS and DB2) in an IMP1 service class. Those that screamed loudest got promoted to imp1. We have just about nothing anymore in imp4 and 5 (but a lot in discretionary - I made sure of that at least). your only option will be to decrease the importance of all other IMP1 address spaces. So true. We are there. Same caveat as before: How dare we (my two colleagues and I) even suggest to take 'their' product out of an imp1 class? How dare we suggest that not all STCs are created equal or have equal priority? And have you noticed how many 'new' products make themselves go into at least SYSSTC by 'absolutely needing' a SCHEDxx entry? When I rewrote the policy (still haven't been allowed to do rollout), I classified them all ahead of the SPM rule for SYSSTC, of course at a lower importance! Regards, Barbara Nitz -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: WLM Imp1
I looked at my goodies file found: try not to use IMP-1, use I2 for LOVEd ones I like all the points made by Mark. But from my experience at a lot of shops, I think many of them just used IMP=1 for just about everything considered production online. ... Then they would (misguidedly) try and use velocity to make some distinction within that importance level. Amen. Same caveat as before: How dare we (my two colleagues and I) even suggest to take 'their' product out of an imp1 class? Amen. Rgds, Rez -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
