Re: SSI update
If you look at your Logrec SOFTWARE records, it should help to shed some light on your issue. Lizette -Original Message- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of mf db Sent: Wednesday, September 11, 2013 9:25 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: SSI update Hello Sir, Apology for the confusion, Recently in one of my test system I added a subsystem to SSI and i have started experiencing recursive abends. After adding I started seeing some of the STC which were started taking more Real storage(Which Usually doesn't take much during normal). On Wed, Sep 11, 2013 at 8:34 PM, Jon Perryman jperr...@pacbell.net wrote: I'm also confused by your question. What makes you ask this question? What did you read or hear about that made you ask this question? Are you talking about the subsystem interface or is SSI in reference to something else? Any time a program moves information to storage, it is overlaying storage. It's only a bad thing when it overlays the wrong storage. We use the term storage overlay to mean overlaying the wrong storage. Assembler macro IEFSSI and MVS command SETSSI add/update the SSCT which overlays information in an SSCT or the SSCT chain. If your program overlays the wrong storage, then it can cause abends. Great care must be taken in programs that run from the SSI. The SSI runs all the time and in all address spaces. If something bad happens, you could be IPL'ing your system. Jon Perryman.. From: mf db dbajava...@gmail.com Yes, My question can it cause any abend by overlaying storage ? On Wed, Sep 11, 2013 at 2:43 PM, Lizette Koehler stars...@mindspring.com wrote: Are you asking can it cause an abend by overlaying storage? -Original Message- From: mf db dbajava...@gmail.com I am trying to understand if Dynamic SSI update can overlay the storage. Could someone please shed some light on dynamic SSI update. -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
SSI update
Hello All, I am trying to understand if Dynamic SSI update can overlay the storage. Could someone please shed some light on dynamic SSI update. Peter -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: SSI update
I am a little confused by overlay storage Are you asking can it cause an abend by overlaying storage? Or are you asking if when you deactivate/active SSI does it replace what was there with new information? Could you clarify more of what direction you question is going? Is there a problem or issue or concept you are trying to handle? I did a quick internet search on IBM SSI DYNAMIC and came up with this presentation from Share 2004. Maybe it can help http://www-03.ibm.com/support/techdocs/atsmastr.nsf/5cb5ed706d254a8186256c71 006d2e0a/0d43ec382b0f111c8625730f0071eef7/$FILE/s2852pr.pdf Dynamic subsystems are those subsystems that can be defined in one of the following ways: Processing the keyword format IEFSSNxx parmlib member during IPL Issuing the IEFSSI macro Issuing the SETSSI system command. Subsystems have the choice of being dynamic. Subsystems that are not dynamic can be defined only at IPL using the positional form of the IEFSSNxx parmlib member, in which case, they cannot use dynamic SSI services. In addition to its role in communicating with subsystems, the SSI provides a set of authorized system services that are available only to dynamic subsystems that installations, applications and subsystems can invoke to: Define (add) a new subsystem dynamically (without requiring an IPL) Activate a subsystem that is already defined Deactivate a subsystem that is already defined Store and retrieve subsystem-dependent information Define subsystem options, which include deciding: If a subsystem can respond to the SSI commands Which subsystem a subsystem should start under. Query subsystem information Define and modify the response of a subsystem to function requests. Defining or adding a subsystem is primarily a way of making the subsystem's unique name known to the system. A subsystem is active when it is ready to process requests that the SSI directs to it. To deactivate a subsystem, the subsystem informs the SSI that it is no longer accepting requests. For example, a subsystem may request that it be deactivated to update the list of function requests that it supports, or to respond to a problem. The dynamic SSI services reject any requests to manipulate subsystems that were not defined dynamically. The services that allow installations, applications and subsystems to define and modify the response of a subsystem to function requests replace and enhance the existing IEFJSVEC service. You can still use the existing IEFJSVEC service, which is described in Using IEFJSVEC with Your Subsystem, however IBMR recommends that you use the services described in Services for Building and Using Your Subsystem instead of IEFJSVEC. These services provide an easier way to define or change the functional response of a subsystem. Lizette -Original Message- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of mf db Sent: Wednesday, September 11, 2013 12:33 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: SSI update Hello All, I am trying to understand if Dynamic SSI update can overlay the storage. Could someone please shed some light on dynamic SSI update. Peter -- 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: SSI update
Hello Lizette, Yes, My question can it cause any abend by overlaying storage ? On Wed, Sep 11, 2013 at 2:43 PM, Lizette Koehler stars...@mindspring.comwrote: I am a little confused by overlay storage Are you asking can it cause an abend by overlaying storage? Or are you asking if when you deactivate/active SSI does it replace what was there with new information? Could you clarify more of what direction you question is going? Is there a problem or issue or concept you are trying to handle? I did a quick internet search on IBM SSI DYNAMIC and came up with this presentation from Share 2004. Maybe it can help http://www-03.ibm.com/support/techdocs/atsmastr.nsf/5cb5ed706d254a8186256c71 006d2e0a/0d43ec382b0f111c8625730f0071eef7/$FILE/s2852pr.pdf Dynamic subsystems are those subsystems that can be defined in one of the following ways: Processing the keyword format IEFSSNxx parmlib member during IPL Issuing the IEFSSI macro Issuing the SETSSI system command. Subsystems have the choice of being dynamic. Subsystems that are not dynamic can be defined only at IPL using the positional form of the IEFSSNxx parmlib member, in which case, they cannot use dynamic SSI services. In addition to its role in communicating with subsystems, the SSI provides a set of authorized system services that are available only to dynamic subsystems that installations, applications and subsystems can invoke to: Define (add) a new subsystem dynamically (without requiring an IPL) Activate a subsystem that is already defined Deactivate a subsystem that is already defined Store and retrieve subsystem-dependent information Define subsystem options, which include deciding: If a subsystem can respond to the SSI commands Which subsystem a subsystem should start under. Query subsystem information Define and modify the response of a subsystem to function requests. Defining or adding a subsystem is primarily a way of making the subsystem's unique name known to the system. A subsystem is active when it is ready to process requests that the SSI directs to it. To deactivate a subsystem, the subsystem informs the SSI that it is no longer accepting requests. For example, a subsystem may request that it be deactivated to update the list of function requests that it supports, or to respond to a problem. The dynamic SSI services reject any requests to manipulate subsystems that were not defined dynamically. The services that allow installations, applications and subsystems to define and modify the response of a subsystem to function requests replace and enhance the existing IEFJSVEC service. You can still use the existing IEFJSVEC service, which is described in Using IEFJSVEC with Your Subsystem, however IBMR recommends that you use the services described in Services for Building and Using Your Subsystem instead of IEFJSVEC. These services provide an easier way to define or change the functional response of a subsystem. Lizette -Original Message- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of mf db Sent: Wednesday, September 11, 2013 12:33 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: SSI update Hello All, I am trying to understand if Dynamic SSI update can overlay the storage. Could someone please shed some light on dynamic SSI update. Peter -- 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 -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: SSI update
In capikfhevlqhxirnrfqqf63rofqa+_ra1d2mmzvcygg+mwnt...@mail.gmail.com, on 09/11/2013 at 01:02 PM, mf db dbajava...@gmail.com said: I am trying to understand if Dynamic SSI update can overlay the storage. If you provide your own subsystem, it can overlay storage; it doesn't matter whether you specify it in IEFSSNxx or in IEFSSI. Unless there is a bug in it, IEFSSI doesn't overlay any storage that it shouldn't, and a bug in your code is far more likely than a bug in something so small and so heavily used. -- Shmuel (Seymour J.) Metz, SysProg and JOAT Atid/2http://patriot.net/~shmuel We don't care. We don't have to care, we're Congress. (S877: The Shut up and Eat Your spam act of 2003) -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: SSI update
I'm also confused by your question. What makes you ask this question? What did you read or hear about that made you ask this question? Are you talking about the subsystem interface or is SSI in reference to something else? Any time a program moves information to storage, it is overlaying storage. It's only a bad thing when it overlays the wrong storage. We use the term storage overlay to mean overlaying the wrong storage. Assembler macro IEFSSI and MVS command SETSSI add/update the SSCT which overlays information in an SSCT or the SSCT chain. If your program overlays the wrong storage, then it can cause abends. Great care must be taken in programs that run from the SSI. The SSI runs all the time and in all address spaces. If something bad happens, you could be IPL'ing your system. Jon Perryman.. From: mf db dbajava...@gmail.com Yes, My question can it cause any abend by overlaying storage ? On Wed, Sep 11, 2013 at 2:43 PM, Lizette Koehler stars...@mindspring.comwrote: Are you asking can it cause an abend by overlaying storage? -Original Message- From: mf db dbajava...@gmail.com I am trying to understand if Dynamic SSI update can overlay the storage. Could someone please shed some light on dynamic SSI update. -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: SSI update
Hello Sir, Apology for the confusion, Recently in one of my test system I added a subsystem to SSI and i have started experiencing recursive abends. After adding I started seeing some of the STC which were started taking more Real storage(Which Usually doesn't take much during normal). On Wed, Sep 11, 2013 at 8:34 PM, Jon Perryman jperr...@pacbell.net wrote: I'm also confused by your question. What makes you ask this question? What did you read or hear about that made you ask this question? Are you talking about the subsystem interface or is SSI in reference to something else? Any time a program moves information to storage, it is overlaying storage. It's only a bad thing when it overlays the wrong storage. We use the term storage overlay to mean overlaying the wrong storage. Assembler macro IEFSSI and MVS command SETSSI add/update the SSCT which overlays information in an SSCT or the SSCT chain. If your program overlays the wrong storage, then it can cause abends. Great care must be taken in programs that run from the SSI. The SSI runs all the time and in all address spaces. If something bad happens, you could be IPL'ing your system. Jon Perryman.. From: mf db dbajava...@gmail.com Yes, My question can it cause any abend by overlaying storage ? On Wed, Sep 11, 2013 at 2:43 PM, Lizette Koehler stars...@mindspring.com wrote: Are you asking can it cause an abend by overlaying storage? -Original Message- From: mf db dbajava...@gmail.com I am trying to understand if Dynamic SSI update can overlay the storage. Could someone please shed some light on dynamic SSI update. -- 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: Recursive SSI abend - Was: SSI update
No apology needed. The problem is with the subsystem you added. You will need to capture the abend information and analyze it. Look at logrec to see if a record was generated for it. If not, then you probably need to capture a dump. Or maybe the abend messages that you are looking at would help. Since the SSI is called regularly, this probably is not be a recursive abend. Jon Perryman. From: mf db dbajava...@gmail.com Apology for the confusion, Recently in one of my test system I added a subsystem to SSI and i have started experiencing recursive abends. After adding I started seeing some of the STC which were started taking more Real storage(Which Usually doesn't take much during normal). -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
