Re: SVCDUMP consideration
>Are there any CPU spike due to SVCDUMP ? Of course there is. An SVC Dump takes a lot of cycles. And of course there is a spike in the consumption of frames needed to capture the data (whether that is real or auxiliary storage). z/OS attempts to make sure that this frame consumption does not have a significantly adverse affect on the rest of the system. >Generally what are the factors needs to be considered while taking SVCDUMP I'd think that your primary consideration is to try to make sure that SVC Dump is capturing the data that you need it to capture to diagnose the problem for which you are taking the dump, via such keywords as LIST, SUMLST, and SDATA. In general, the system is set non-dispatchable until SVC Dump captures (not writes to data set) common storage, and the individual address space(s) being dumped are set non-dispatchable until their storage is captured. As with just about everything, there are exceptions. But if you want a "good" dump (i.e., one with consistent data), those things will have to happen Peter Relson z/OS Core Technology Design -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: SVCDUMP consideration
SVCDUMPs can go to SYS1.DUMPx or a dynamic allocation based on your settings in z/OS Look at the mvs command for Dump Datasets (DD) for what your shop is using. See this link: https://www.ibm.com/support/knowledgecenter/SSLTBW_2.1.0/com.ibm.zos.v2r1.ieag100/dumpds.htm SVC Dumps can contain as much or as little as specified. Some products dump a large amount of control blocks (Think DB2) So just a few. The Dump process has a Dataspace it dumps to. So the process is fast. Once the Dump goes to the dataspace, it is then dumped to your designated SVC Dump dataset A quick search on the www.ibm.com for SVCDUMP DD pulls up this link https://www.ibm.com/support/knowledgecenter/SSLTBW_2.1.0/com.ibm.zos.v2r1.ieav100/seqdat.htm It should be a good starting point. How SVCDUMP behaves is going to be dependent on how you have it set up. There is not a one size fits all process. Lizette > -Original Message- > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On > Behalf Of Jake Anderson > Sent: Tuesday, August 08, 2017 6:47 AM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: Re: SVCDUMP consideration > > Hi > > General questions. Since when we set SAD for zOS we keep that based on the > size of Real storage. > > When we are setting up an SVCDUMP for a particular product. How does that > dumping takes place ? Is it only the control block occupied by the specific > product ? Or it scans the entire RSM dedicated to the OS ? > > On 08-Aug-2017 3:56 PM, "Elardus Engelbrecht" < > elardus.engelbre...@sita.co.za> wrote: > > > Jake Anderson wrote: > > > > >Is there any constraint when we are taking SVCDUMP ? Are there any > > >CPU > > spike due to SVCDUMP ? > > > > It depends. Sometimes you get a CPU spike or something slows down your > > system. YMMV of course. > > > > It also depends on how the application or job is handling the dump itself. > > > > > > >Generally what are the factors needs to be considered while taking > > SVCDUMP ? > > > > Check Kees good reply to you. The command he gave is a good starting point. > > > > Also look in your PARMLIB to see how your DD and CD commands are setup. > > These commands are usually in COMMNDxx or IEACMDxx. > > > > Depending on the dump, you may need to add the right DD statement to > > your STC or job ___before__ taking a dump. > > > > Are you also going to set a SLIP? > > > > Groete / Greetings > > Elardus Engelbrecht -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: SVCDUMP consideration
Hi General questions. Since when we set SAD for zOS we keep that based on the size of Real storage. When we are setting up an SVCDUMP for a particular product. How does that dumping takes place ? Is it only the control block occupied by the specific product ? Or it scans the entire RSM dedicated to the OS ? On 08-Aug-2017 3:56 PM, "Elardus Engelbrecht" < elardus.engelbre...@sita.co.za> wrote: > Jake Anderson wrote: > > >Is there any constraint when we are taking SVCDUMP ? Are there any CPU > spike due to SVCDUMP ? > > It depends. Sometimes you get a CPU spike or something slows down your > system. YMMV of course. > > It also depends on how the application or job is handling the dump itself. > > > >Generally what are the factors needs to be considered while taking > SVCDUMP ? > > Check Kees good reply to you. The command he gave is a good starting point. > > Also look in your PARMLIB to see how your DD and CD commands are setup. > These commands are usually in COMMNDxx or IEACMDxx. > > Depending on the dump, you may need to add the right DD statement to your > STC or job ___before__ taking a dump. > > Are you also going to set a SLIP? > > Groete / Greetings > Elardus Engelbrecht > > -- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: SVCDUMP consideration
Jake Anderson wrote: >Is there any constraint when we are taking SVCDUMP ? Are there any CPU spike >due to SVCDUMP ? It depends. Sometimes you get a CPU spike or something slows down your system. YMMV of course. It also depends on how the application or job is handling the dump itself. >Generally what are the factors needs to be considered while taking SVCDUMP ? Check Kees good reply to you. The command he gave is a good starting point. Also look in your PARMLIB to see how your DD and CD commands are setup. These commands are usually in COMMNDxx or IEACMDxx. Depending on the dump, you may need to add the right DD statement to your STC or job ___before__ taking a dump. Are you also going to set a SLIP? Groete / Greetings Elardus Engelbrecht -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: SVCDUMP consideration
Have a look at the Q= SDUMP option, this specifies if the system will be quiesced while dumping common storage. Command: D DUMP,O. Kees. > -Original Message- > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On > Behalf Of Jake Anderson > Sent: 08 August, 2017 11:25 > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: SVCDUMP consideration > > Hi > > Is there any constraint when we are taking SVCDUMP ? Are there any CPU > spike due to SVCDUMP ? > > Generally what are the factors needs to be considered while taking > SVCDUMP ? > > Jake > > -- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN 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...@listserv.ua.edu with the message: INFO IBM-MAIN
SVCDUMP consideration
Hi Is there any constraint when we are taking SVCDUMP ? Are there any CPU spike due to SVCDUMP ? Generally what are the factors needs to be considered while taking SVCDUMP ? Jake -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
