I would say it is 168 years (24*7=168).
And to avoid such comments I usually write 24/7/365. :-)
--
Radoslaw Skorupka
Lodz, Poland
W dniu 15.09.2021 o 19:41, Lennie Dymoke-Bradshaw pisze:
24x7x365 is actually 7 years. 😊.
Lennie
-----Original Message-----
From: IBM Mainframe Discussion List <[email protected]> On Behalf Of
Mike Schwab
Sent: 15 September 2021 17:59
To: [email protected]
Subject: Re: IPL's POR's frequency
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 <[email protected]> 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: [email protected]
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" <[email protected]>
To: [email protected]
Date: 15/09/2021 09:35
Subject: [EXTERNAL] Re: IPL's POR's frequency
Sent by: "IBM Mainframe Discussion List" <[email protected]>
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
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Mike A Schwab, Springfield IL USA
Where do Forest Rangers go to get away from it all?
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