Mainframes have been powered up 24*7*365 for their lifetime (a decade + in some cases) since the 1960s. Just the occasional off / on cycle if required.
On Wed, Sep 15, 2021 at 4:07 AM Martin Packer <martin_pac...@uk.ibm.com> wrote: > > It's amazing to think a machine could effectively be powered up > continuously for quite a few years - even if it's not neglected. > > Amazing and good. > > Cheers, Martin > > Martin Packer > > WW z/OS Performance, Capacity and Architecture, IBM Technology Sales > > +44-7802-245-584 > > email: martin_pac...@uk.ibm.com > > Twitter / Facebook IDs: MartinPacker > > Blog: https://mainframeperformancetopics.com > > Mainframe, Performance, Topics Podcast Series (With Marna Walle): > https://anchor.fm/marna-walle > > Youtube channel: https://www.youtube.com/channel/UCu_65HaYgksbF6Q8SQ4oOvA > > > > From: "Radoslaw Skorupka" <r.skoru...@hotmail.com> > To: IBM-MAIN@LISTSERV.UA.EDU > Date: 15/09/2021 09:35 > Subject: [EXTERNAL] Re: IPL's POR's frequency > Sent by: "IBM Mainframe Discussion List" <IBM-MAIN@LISTSERV.UA.EDU> > > > > My €0.02 > > IPL - never scheduled. Only when needed. Typical scenarios: > 1. Configuration error, which need IPL (very rare, fortunately) > 2. Hardware or software changes require IPL (maybe once a year, but IMHO > less) > 3. OPPORTUNITY. Yes - there are several disruptive application software > releases per year. There is no problem to "steal" half an hour for "our > own tasks" which may include IPL. However this point is usually > connected to 2. which means HW/SW changes simply wait for such > opportunity. > > IML/POR - never. > Exception could be disruptive machine maintenance, like memory (physical > DIMM) add or drawer preventive replacement. > In the past there were disruptive microcode driver changes. > > -- > Radoslaw Skorupka > Lodz, Poland > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > > > 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...@listserv.ua.edu with the message: INFO IBM-MAIN -- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
