Re: Impact of XCF offline
Others have offered good reasons for V XCF,OFF rather than just RESETting an LPAR. Here's another. With a minimal amount of configuration, you can enable 'reIPL' to act on this command: V XCF,sysname,OFF,REIPL ReIPL is immediate and can only use the current sysres volume. That's not always what you want. You may need intervening time to perform some activity. or you may want to change sysres volumes. If reIPL fills the bill, you can IPL a system with no delay entirely via console command. No HMC necessary. This is important to us for sandbox systems where reIPL can be accomplished entirely by folks who don't have HMC access. . . JO.Skip Robinson Southern California Edison Company Electric Dragon Team Paddler SHARE MVS Program Co-Manager 626-302-7535 Office 323-715-0595 Mobile jo.skip.robin...@sce.com From: Tom Ambros To: IBM-MAIN@LISTSERV.UA.EDU, Date: 01/20/2014 05:18 AM Subject: Re: Impact of XCF offline Sent by:IBM Mainframe Discussion List You don't have another working console in the sysplex? If you don't vary the offending system out of the sysplex when it behaves as you describe it'll be a while (failure interval) before serialized resources are freed up and any new serialization takes place, if I remember correctly. If you don't have the luxury of a sysplex that is all non-production you run the risk of affecting your production workload. We went to the trouble of implementing the BCPii interface to handle a system that can't be partitioned because it is unreachable by any other means just for this situation. I forget precisely what they called it, the first iteration was a function in System Automation. It was a while back we did it. Thomas Ambros Operating Systems and Connectivity Engineering 518-436-6433 From: "van der Grijn, Bart (B)" To: IBM-MAIN@LISTSERV.UA.EDU Date: 01/20/2014 07:59 Subject:Re: Impact of XCF offline Sent by:IBM Mainframe Discussion List Peter, We used to IPL our systems without the V XCF,,OFFLINE. That worked for years until we started to run into issues with signaling structures (one of the systems would occasionally not use one of the signaling structures after an IPL). We opened a PMR and IBM's response was to perform the V XCF as per < http://www-03.ibm.com/systems/z/advantages/pso/removing.html>. We changed our IPL procedure and haven't seen the problem since. (This was back in z/OS 1.10) So yes, we did see an impact with not using the V XCF OFFLINE. Bart -Original Message- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of mf db Sent: Sunday, January 19, 2014 9:05 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Impact of XCF offline Hello All, This question might sound little basic and dummy, but my apologies first. There are some situation in our shop when one of our Development LPAR do undergo to unresponsive state(This happens when our developers do some destructive testings or many other factors) and even we cannot issue any commands on Console. To resolve this we just do a de-activate and activate to re-ipl the system. As a normal IPL procedure we issue V XCF,OFF,SYSNAME=something. Will there be any impact to the system when we do not issue the V XCF,OFFLINE and just do a de-activate and activate ? Peter -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Impact of XCF offline
You don't have another working console in the sysplex? If you don't vary the offending system out of the sysplex when it behaves as you describe it'll be a while (failure interval) before serialized resources are freed up and any new serialization takes place, if I remember correctly. If you don't have the luxury of a sysplex that is all non-production you run the risk of affecting your production workload. We went to the trouble of implementing the BCPii interface to handle a system that can't be partitioned because it is unreachable by any other means just for this situation. I forget precisely what they called it, the first iteration was a function in System Automation. It was a while back we did it. Thomas Ambros Operating Systems and Connectivity Engineering 518-436-6433 From: "van der Grijn, Bart (B)" To: IBM-MAIN@LISTSERV.UA.EDU Date: 01/20/2014 07:59 Subject:Re: Impact of XCF offline Sent by:IBM Mainframe Discussion List Peter, We used to IPL our systems without the V XCF,,OFFLINE. That worked for years until we started to run into issues with signaling structures (one of the systems would occasionally not use one of the signaling structures after an IPL). We opened a PMR and IBM's response was to perform the V XCF as per < http://www-03.ibm.com/systems/z/advantages/pso/removing.html>. We changed our IPL procedure and haven't seen the problem since. (This was back in z/OS 1.10) So yes, we did see an impact with not using the V XCF OFFLINE. Bart -Original Message- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of mf db Sent: Sunday, January 19, 2014 9:05 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Impact of XCF offline Hello All, This question might sound little basic and dummy, but my apologies first. There are some situation in our shop when one of our Development LPAR do undergo to unresponsive state(This happens when our developers do some destructive testings or many other factors) and even we cannot issue any commands on Console. To resolve this we just do a de-activate and activate to re-ipl the system. As a normal IPL procedure we issue V XCF,OFF,SYSNAME=something. Will there be any impact to the system when we do not issue the V XCF,OFFLINE and just do a de-activate and activate ? Peter -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN This communication may contain privileged and/or confidential information. It is intended solely for the use of the addressee. If you are not the intended recipient, you are strictly prohibited from disclosing, copying, distributing or using any of this information. If you received this communication in error, please contact the sender immediately and destroy the material in its entirety, whether electronic or hard copy. This communication may contain nonpublic personal information about consumers subject to the restrictions of the Gramm-Leach-Bliley Act. You may not directly or indirectly reuse or redisclose such information for any purpose other than to provide the services for which you are receiving the information. 127 Public Square, Cleveland, OH 44114 If you prefer not to receive future e-mail offers for products or services from Key send an e-mail to mailto:dnereque...@key.com with 'No Promotional E-mails' in the SUBJECT line. -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Impact of XCF offline
Peter, We used to IPL our systems without the V XCF,,OFFLINE. That worked for years until we started to run into issues with signaling structures (one of the systems would occasionally not use one of the signaling structures after an IPL). We opened a PMR and IBM's response was to perform the V XCF as per <http://www-03.ibm.com/systems/z/advantages/pso/removing.html>. We changed our IPL procedure and haven't seen the problem since. (This was back in z/OS 1.10) So yes, we did see an impact with not using the V XCF OFFLINE. Bart -Original Message- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of mf db Sent: Sunday, January 19, 2014 9:05 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Impact of XCF offline Hello All, This question might sound little basic and dummy, but my apologies first. There are some situation in our shop when one of our Development LPAR do undergo to unresponsive state(This happens when our developers do some destructive testings or many other factors) and even we cannot issue any commands on Console. To resolve this we just do a de-activate and activate to re-ipl the system. As a normal IPL procedure we issue V XCF,OFF,SYSNAME=something. Will there be any impact to the system when we do not issue the V XCF,OFFLINE and just do a de-activate and activate ? Peter -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Impact of XCF offline
Depending on what you regard as "impact", I think the answer is MAYBE. The surviving will hang waiting for the other system to come back up. If this takes 10 minutes, the surviving system will be hung (waiting) for these 10 minutes. Doing the V Offline, tells the system to not wait for the other system and it will resync once the other system finishes Re-IPL'ing. Your IMS/CICS/DB2 subsystems will be hung/unresponsive for the 10 minutes so the V OFFLINE is a better idea (it is the same as the other system doing an orderly shutdown and thus withdrawing from the sysplex). At 14:55 + on 01/19/2014, Staller, Allan wrote about Re: Impact of XCF offline: I do not believe there will be any impact the z/OS level. IMS/CICS/DB2 may have different requirements The surviving system will issue messages a "wait" until it sees the failing system attempting to rejoin the sysplex. The failing system will be re-initialized so no prob... HTH, There are some situation in our shop when one of our Development LPAR do undergo to unresponsive state(This happens when our developers do some destructive testings or many other factors) and even we cannot issue any commands on Console. To resolve this we just do a de-activate and activate to re-ipl the system. As a normal IPL procedure we issue V XCF,OFF,SYSNAME=something. Will there be any impact to the system when we do not issue the V XCF,OFFLINE and just do a de-activate and activate ? -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Impact of XCF offline
I do not believe there will be any impact the z/OS level. IMS/CICS/DB2 may have different requirements The surviving system will issue messages a "wait" until it sees the failing system attempting to rejoin the sysplex. The failing system will be re-initialized so no prob... HTH, There are some situation in our shop when one of our Development LPAR do undergo to unresponsive state(This happens when our developers do some destructive testings or many other factors) and even we cannot issue any commands on Console. To resolve this we just do a de-activate and activate to re-ipl the system. As a normal IPL procedure we issue V XCF,OFF,SYSNAME=something. Will there be any impact to the system when we do not issue the V XCF,OFFLINE and just do a de-activate and activate ? -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Impact of XCF offline
Hello All, This question might sound little basic and dummy, but my apologies first. There are some situation in our shop when one of our Development LPAR do undergo to unresponsive state(This happens when our developers do some destructive testings or many other factors) and even we cannot issue any commands on Console. To resolve this we just do a de-activate and activate to re-ipl the system. As a normal IPL procedure we issue V XCF,OFF,SYSNAME=something. Will there be any impact to the system when we do not issue the V XCF,OFFLINE and just do a de-activate and activate ? Peter -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
