z/OS 2.3 Memory Requirements on z14

[Mike Smith]

Can anyone share their experiences running z/OS 2.3 on a z14 or z14 ZR1 in an LPAR with less than the required 8GB of memory? Other than having to respond to the warning message during IPL, have any negative effects been experienced?

Background:
Excerpt From: https://www.ibm.com/support/knowledgecenter/en/SSLTBW_2.3.0/com.ibm.zos.v2r3.e0zm100/BCP_zNext_Memory_Reqs_V2R3.htm

Ensure that enough real memory is installed

Description

For z/OS V2R3 with the IBM z14™ (z14) server, a minimum of 8 GB of real memory is required to IPL. When running as a z/VM guest or on an IBM Z® Personal Development Tool (zPDT), a minimum of 2 GB is required for z/OS V2R3.

If you attempt to IPL z/OS V2R3 on a z14 with less than the minimum amount of real memory, z/OS issues the following warning message (a WTOR) during IPL:
IAR057D LESS THAN 8 GB OF REAL STORAGE IMPACTS SYSTEM AVAILABILITY - ADD STORAGE OR
REPLY C TO CONTINUE

Continuing with less than the minimum amount of real memory might impact the availability of your system. If you attempt to IPL z/OS V2R3 on an earlier IBM server, no warning message is issued.

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[R.S.]

IMHO it is not worth testing time.
Yes, the system itselft can work with less than 8GB (see z/VM or z/PDT),
but the system with subsystems started may not perform well.
In my shop 16GB is minimal amount of memory assigned to LPAR. It can be
doubled, tripled, etc.
--
Radoslaw Skorupka
Lodz, Poland

Post by Mike Smith
Can anyone share their experiences running z/OS 2.3 on a z14 or z14 ZR1 in an LPAR with less than the required 8GB of memory? Other than having to respond to the warning message during IPL, have any negative effects been experienced?
Excerpt From: https://www.ibm.com/support/knowledgecenter/en/SSLTBW_2.3.0/com.ibm.zos.v2r3.e0zm100/BCP_zNext_Memory_Reqs_V2R3.htm
Ensure that enough real memory is installed
Description
For z/OS V2R3 with the IBM z14™ (z14) server, a minimum of 8 GB of real memory is required to IPL. When running as a z/VM guest or on an IBM Z® Personal Development Tool (zPDT), a minimum of 2 GB is required for z/OS V2R3.
IAR057D LESS THAN 8 GB OF REAL STORAGE IMPACTS SYSTEM AVAILABILITY - ADD STORAGE OR
REPLY C TO CONTINUE
Continuing with less than the minimum amount of real memory might impact the availability of your system. If you attempt to IPL z/OS V2R3 on an earlier IBM server, no warning message is issued.

...

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[Lizette Koehler]

Maybe I am incorrect, but I thought when you ordered a z14 it could come with triple the amount of memory for the same cost of memory you were currently paying.

For example, if you were using on a NON z14 8G, then when you order a z14 it could done with 24G but at the same price as the 8G memory.

Or was that one of IBM's wild marketing promises.

Lizette

-----Original Message-----
Mike Smith
Sent: Monday, February 25, 2019 8:53 AM
Subject: z/OS 2.3 Memory Requirements on z14
Can anyone share their experiences running z/OS 2.3 on a z14 or z14 ZR1 in an
LPAR with less than the required 8GB of memory? Other than having to respond
to the warning message during IPL, have any negative effects been
experienced?
https://www.ibm.com/support/knowledgecenter/en/SSLTBW_2.3.0/com.ibm.zos.v2r3.
e0zm100/BCP_zNext_Memory_Reqs_V2R3.htm
Ensure that enough real memory is installed
Description
For z/OS V2R3 with the IBM z14™ (z14) server, a minimum of 8 GB of real
memory is required to IPL. When running as a z/VM guest or on an IBM Z®
Personal Development Tool (zPDT), a minimum of 2 GB is required for z/OS
V2R3.
If you attempt to IPL z/OS V2R3 on a z14 with less than the minimum amount of
IAR057D LESS THAN 8 GB OF REAL STORAGE IMPACTS SYSTEM AVAILABILITY - ADD
STORAGE OR REPLY C TO CONTINUE
Continuing with less than the minimum amount of real memory might impact the
availability of your system. If you attempt to IPL z/OS V2R3 on an earlier
IBM server, no warning message is issued.
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions, send email to

...

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[Michael Babcock]

When we ordered our ZR1 we still had to specify the amount of memory we
wanted. We did order substantially more central storage. I don’t know
the costs involved so can’t directly answer your question.

Post by Lizette Koehler
Maybe I am incorrect, but I thought when you ordered a z14 it could come
with triple the amount of memory for the same cost of memory you were
currently paying.
For example, if you were using on a NON z14 8G, then when you order a z14
it could done with 24G but at the same price as the 8G memory.
Or was that one of IBM's wild marketing promises.
Lizette

-----Original Message-----

Behalf Of

Mike Smith
Sent: Monday, February 25, 2019 8:53 AM
Subject: z/OS 2.3 Memory Requirements on z14
Can anyone share their experiences running z/OS 2.3 on a z14 or z14 ZR1

in an

LPAR with less than the required 8GB of memory? Other than having to

respond

to the warning message during IPL, have any negative effects been
experienced?

https://www.ibm.com/support/knowledgecenter/en/SSLTBW_2.3.0/com.ibm.zos.v2r3
.

e0zm100/BCP_zNext_Memory_Reqs_V2R3.htm
Ensure that enough real memory is installed
Description
For z/OS V2R3 with the IBM z14™ (z14) server, a minimum of 8 GB of real
memory is required to IPL. When running as a z/VM guest or on an IBM Z®
Personal Development Tool (zPDT), a minimum of 2 GB is required for z/OS
V2R3.
If you attempt to IPL z/OS V2R3 on a z14 with less than the minimum

amount of

real memory, z/OS issues the following warning message (a WTOR) during
IAR057D LESS THAN 8 GB OF REAL STORAGE IMPACTS SYSTEM AVAILABILITY - ADD
STORAGE OR REPLY C TO CONTINUE
Continuing with less than the minimum amount of real memory might impact

the

availability of your system. If you attempt to IPL z/OS V2R3 on an

earlier

IBM server, no warning message is issued.
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email to
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[Laurence Chiu]

We ordered our ZR1 with 96G of memory since that was recommended based on
our planned usage and growth.

Not sure how much was the memory component but small in terms of the other
components.

Post by Michael Babcock
When we ordered our ZR1 we still had to specify the amount of memory we
wanted. We did order substantially more central storage. I don’t know
the costs involved so can’t directly answer your question.

Post by Lizette Koehler
Maybe I am incorrect, but I thought when you ordered a z14 it could come
with triple the amount of memory for the same cost of memory you were
currently paying.
For example, if you were using on a NON z14 8G, then when you order a z14
it could done with 24G but at the same price as the 8G memory.
Or was that one of IBM's wild marketing promises.
Lizette

-----Original Message-----

Behalf Of

Mike Smith
Sent: Monday, February 25, 2019 8:53 AM
Subject: z/OS 2.3 Memory Requirements on z14
Can anyone share their experiences running z/OS 2.3 on a z14 or z14 ZR1

in an

LPAR with less than the required 8GB of memory? Other than having to

respond

to the warning message during IPL, have any negative effects been
experienced?

https://www.ibm.com/support/knowledgecenter/en/SSLTBW_2.3.0/com.ibm.zos.v2r3

Post by Lizette Koehler
.

e0zm100/BCP_zNext_Memory_Reqs_V2R3.htm
Ensure that enough real memory is installed
Description
For z/OS V2R3 with the IBM z14™ (z14) server, a minimum of 8 GB of real
memory is required to IPL. When running as a z/VM guest or on an IBM Z®
Personal Development Tool (zPDT), a minimum of 2 GB is required for

z/OS

Post by Lizette Koehler

V2R3.
If you attempt to IPL z/OS V2R3 on a z14 with less than the minimum

amount of

real memory, z/OS issues the following warning message (a WTOR) during
IAR057D LESS THAN 8 GB OF REAL STORAGE IMPACTS SYSTEM AVAILABILITY -

ADD

Post by Lizette Koehler

STORAGE OR REPLY C TO CONTINUE
Continuing with less than the minimum amount of real memory might

impact

Post by Lizette Koehler
the

availability of your system. If you attempt to IPL z/OS V2R3 on an

earlier

IBM server, no warning message is issued.
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--
Michael Babcock
OneMain Financial
z/OS Systems Programmer, Lead
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[Charles Mills]

I certainly heard that offer several times. I'm not a customer; I heard it as an IBM "partner."

Charles

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-***@LISTSERV.UA.EDU] On Behalf Of Lizette Koehler
Sent: Monday, February 25, 2019 11:24 AM
To: IBM-***@LISTSERV.UA.EDU
Subject: Re: z/OS 2.3 Memory Requirements on z14

Maybe I am incorrect, but I thought when you ordered a z14 it could come with triple the amount of memory for the same cost of memory you were currently paying.

For example, if you were using on a NON z14 8G, then when you order a z14 it could done with 24G but at the same price as the 8G memory.

Or was that one of IBM's wild marketing promises.

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send email to ***@listserv.ua.edu with the message: INFO IBM-MAIN

[Mike Smith]

Not quite. The minimum amount of memory on a z14 ZR1 is 64GB (256GB on the larger z14).

At first, 64GB sounds like "plenty." But if you are supporting a number of LPARs with small memory allocations, you can use of the 64GB pretty quickly.

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-***@LISTSERV.UA.EDU] On Behalf Of Lizette Koehler
Sent: Monday, February 25, 2019 11:24 AM
To: IBM-***@LISTSERV.UA.EDU
Subject: Re: z/OS 2.3 Memory Requirements on z14

Maybe I am incorrect, but I thought when you ordered a z14 it could come with triple the amount of memory for the same cost of memory you were currently paying.

For example, if you were using on a NON z14 8G, then when you order a z14 it could done with 24G but at the same price as the 8G memory.

Or was that one of IBM's wild marketing promises.

Lizette

-----Original Message-----
Mike Smith
Sent: Monday, February 25, 2019 8:53 AM
Subject: z/OS 2.3 Memory Requirements on z14
Can anyone share their experiences running z/OS 2.3 on a z14 or z14 ZR1 in an
LPAR with less than the required 8GB of memory? Other than having to respond
to the warning message during IPL, have any negative effects been
experienced?
https://www.ibm.com/support/knowledgecenter/en/SSLTBW_2.3.0/com.ibm.zos.v2r3.
e0zm100/BCP_zNext_Memory_Reqs_V2R3.htm
Ensure that enough real memory is installed
Description
For z/OS V2R3 with the IBM z14™ (z14) server, a minimum of 8 GB of real
memory is required to IPL. When running as a z/VM guest or on an IBM Z®
Personal Development Tool (zPDT), a minimum of 2 GB is required for z/OS
V2R3.
If you attempt to IPL z/OS V2R3 on a z14 with less than the minimum amount of
IAR057D LESS THAN 8 GB OF REAL STORAGE IMPACTS SYSTEM AVAILABILITY - ADD
STORAGE OR REPLY C TO CONTINUE
Continuing with less than the minimum amount of real memory might impact the
availability of your system. If you attempt to IPL z/OS V2R3 on an earlier
IBM server, no warning message is issued.
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...

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[R.S.]

Post by Mike Smith
Not quite. The minimum amount of memory on a z14 ZR1 is 64GB (256GB on the larger z14).
At first, 64GB sounds like "plenty." But if you are supporting a number of LPARs with small memory allocations, you can use of the 64GB pretty quickly.

Any amount of memory can be divided into "many enough" LPARs just to
have memory shortage.
IMHO it's simply unreasonable to purchase such expensive machine lika
z14 with lack of such inexpensvie resource like memory.

64GB is rich configuration for desktop PC nowadays (mine has 32GB, cause
it's standard).
--
Radoslaw Skorupka
Lodz, Poland




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mBank S.A. with its registered office in Warsaw, ul. Senatorska 18, 00-950 Warszawa,www.mBank.pl, e-mail: ***@mBank.pl. District Court for the Capital City of Warsaw, 12th Commercial Division of the National Court Register, KRS 0000025237, NIP: 526-021-50-88. Fully paid-up share capital amounting to PLN 169,248,488 as at 1 January 2018.

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[Martin Packer]

Which is interesting when you consider that most (Windows) PCs are
single-user machines. Macs, BTW, tend to do well in the 8-16GB of memory
range.

So, an 8GB (strongly urged) minimum for a massively multi-user machine
such as z14 isn't really a lot.

And, yes, I know memory usage patterns vary wildly between operating
environments.

Cheers, Martin

Martin Packer

zChampion, Systems Investigator & Performance Troubleshooter, IBM

[phone]

email: ***@uk.ibm.com

Twitter / Facebook IDs: MartinPacker

Blog:
https://www.ibm.com/developerworks/mydeveloperworks/blogs/MartinPacker

Podcast Series (With Marna Walle): https://developer.ibm.com/tv/mpt/ or

https://itunes.apple.com/gb/podcast/mainframe-performance-topics/id1127943573?mt=2


Youtube channel: https://www.youtube.com/channel/UCu_65HaYgksbF6Q8SQ4oOvA



From: "R.S." <***@BREMULTIBANK.COM.PL>
To: IBM-***@LISTSERV.UA.EDU
Date: 26/02/2019 09:33
Subject: Re: z/OS 2.3 Memory Requirements on z14

Post by Mike Smith
Not quite. The minimum amount of memory on a z14 ZR1 is 64GB (256GB on the larger z14).
At first, 64GB sounds like "plenty." But if you are supporting a

number of LPARs with small memory allocations, you can use of the 64GB
pretty quickly.
Any amount of memory can be divided into "many enough" LPARs just to
have memory shortage.
IMHO it's simply unreasonable to purchase such expensive machine lika
z14 with lack of such inexpensvie resource like memory.

64GB is rich configuration for desktop PC nowadays (mine has 32GB, cause
it's standard).
--
Radoslaw Skorupka
Lodz, Poland




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Jeśli nie jesteś adresatem tej wiadomości:

- powiadom nas o tym w mailu zwrotnym (dziękujemy!),
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wykorzystać tylko adresat.Przypominamy, że każdy, kto rozpowszechnia
(kopiuje, rozprowadza) tę wiadomość lub podejmuje podobne działania,
narusza prawo i może podlegać karze.

mBank S.A. z siedzibą w Warszawie, ul. Senatorska 18, 00-950 Warszawa,
www.mBank.pl, e-mail: ***@mBank.pl. Sąd Rejonowy dla m. st. Warszawy
XII Wydział Gospodarczy Krajowego Rejestru Sądowego, KRS 0000025237, NIP:
526-021-50-88. Kapitał zakładowy (opłacony w całości) według stanu na
01.01.2018 r. wynosi 169.248.488 złotych.

If you are not the addressee of this message:

- let us know by replying to this e-mail (thank you!),
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action, violates the law and may be penalised.

mBank S.A. with its registered office in Warsaw, ul. Senatorska 18, 00-950
Warszawa,www.mBank.pl, e-mail: ***@mBank.pl. District Court for the
Capital City of Warsaw, 12th Commercial Division of the National Court
Register, KRS 0000025237, NIP: 526-021-50-88. Fully paid-up share capital
amounting to PLN 169,248,488 as at 1 January 2018.

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[Parwez Hamid]

All Z systems have a certain amount of minimum memory for customer use in the base system configuration. In addition to this 'customer' memory there is memory for the HSA - again included in the base configuration. If required, customers can purchase extra memory up to the maximum limit for the System.

z14 M/T 3906, Minimum = 256 GB, Standard HSA = 192 GB
z14 M/T 3907, Minimum = 64 GB, Standard HSA = 64 GB
z13 M/T 2964, Minimum = 64 GB, Standard HSA = 96 GB
z13s M/T 2965, Minimum = 64 GB, Standard HSA = 40 GB

For other systems, refer to announcement letters or Redbooks.

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[Parwez Hamid]

My response about memory sizes was purely to correct/inform the misinformed folks who were quoting all sorts of numbers
for the different Systems and stating what IBM or its marketing folks did/did not do :-)

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[Jesse 1 Robinson]

When IBM broached this restriction at SHARE a few years ago in a closed technical session, I was verklempt. We had several LPARs way smaller than the proposed minimum. IBM's argument was that a potpourri of pesky problems were found to stem from puny LPAR sizing. As it is we've had no trouble meeting the minimum on our current boxes.

The amount of blood, sweat, and tears squandered on size-related problems was far out of proportion to the cost of some extra memory.

.
.
J.O.Skip Robinson
Southern California Edison Company
Electric Dragon Team Paddler
SHARE MVS Program Co-Manager
323-715-0595 Mobile
626-543-6132 Office ⇐=== NEW
***@sce.com


-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-***@LISTSERV.UA.EDU] On Behalf Of Allan Staller
Sent: Tuesday, February 26, 2019 5:56 AM
To: IBM-***@LISTSERV.UA.EDU
Subject: (External):FW: z/OS 2.3 Memory Requirements on z14

Forgot to add, this is a "soft" requirement implemented in z/OS 2.3.
i.e. z/OS will run in < 8GB, but if the LPAR is too small, strange things my happen.

-----Original Message-----
From: Allan Staller
Sent: Tuesday, February 26, 2019 7:54 AM
To: 'IBM Mainframe Discussion List' <IBM-***@LISTSERV.UA.EDU>
Subject: RE: z/OS 2.3 Memory Requirements on z14

The storage for the HSA is separate from the "orderable" storage. This has been true for several hardware generations.
AFAIK, this memory size if fixed and cannot be changed.

This has nothing to do with the OP's question.

The OP wanted to know if there was any impact beyond replying to the warning WTOR @ IPL time if the storage allocated to the LPAR was < 8GB.

-----Original Message-----
From: IBM Mainframe Discussion List <IBM-***@LISTSERV.UA.EDU> On Behalf Of Parwez Hamid
Sent: Monday, February 25, 2019 5:53 PM
To: IBM-***@LISTSERV.UA.EDU
Subject: Re: z/OS 2.3 Memory Requirements on z14

All Z systems have a certain amount of minimum memory for customer use in the base system configuration. In addition to this 'customer' memory there is memory for the HSA - again included in the base configuration. If required, customers can purchase extra memory up to the maximum limit for the System.

z14 M/T 3906, Minimum = 256 GB, Standard HSA = 192 GB
z14 M/T 3907, Minimum = 64 GB, Standard HSA = 64 GB
z13 M/T 2964, Minimum = 64 GB, Standard HSA = 96 GB z13s M/T 2965, Minimum = 64 GB, Standard HSA = 40 GB

For other systems, refer to announcement letters or Redbooks.


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