Ok, here is the book for 2.1 http://publibz.boulder.ibm.com/epubs/pdf/e0z3b102.pdf
The minimum real storage requirements to IPL z/OS V2R1 will be documented on the z/OS Installation Web page at GA http://www-03.ibm.com/systems/z/os/ zos/installation/. Led me to: http://www-03.ibm.com/systems/z/os/zos/installation/zOS_V2R1_Install_Migrate.html#ip Where is says: The minimum amount of real storage required to IPL z/OS depends on a number of factors, including the number of devices in the I/O configuration, the amount of storage configured, the number of address spaces created, the types of applications supported, and the products and subsystems supported in the IPLed system. In IPL studies at IBM, 256 MB of real storage was the minimum amount required to IPL z/OS V1R13 and z/OS V2R1. The systems in the studies were IPLed to the point of completing JES2 initialization. The systems had I/O configurations defined with the following devices: 51168 direct access devices (DASDs) 16 graphics devices 5127 channel-to-channel (CTC) connections 52 tape drives _________________________________________________________________ Dave Jousma Assistant Vice President, Mainframe Engineering [email protected] 1830 East Paris, Grand Rapids, MI 49546 MD RSCB2H p 616.653.8429 f 616.653.2717 -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Jousma, David Sent: Friday, December 11, 2015 10:53 AM To: [email protected] Subject: Re: Memory for z/OS 2.1 A quick google search yielded a link to IBM albeit to a manual for z/os 1.12, https://www-01.ibm.com/support/knowledgecenter/SSLTBW_1.12.0/com.ibm.zos.r12.e0zb100/osproc.htm%23prosto and I'm sure the appropriate doc for current versions are available too, finds the following: The minimum amount of real storage required to IPL z/OS depends on a number of factors, including the number of devices in the I/O configuration, the amount of storage configured, the number of address spaces created, the types of applications supported, and the products and subsystems supported in the IPLed system. In IPL studies at IBM, 128 MB of real storage was the minimum amount required to IPL z/OS V1R11, z/OS V1R10, and z/OS V1R9. The systems in the studies were IPLed to the point of completing JES2 initialization. The systems had I/O configurations defined with the following devices: | |•20704 direct access devices (DASDs) |•32 graphics devices |•982 channel-to-channel (CTC) connections 40 tape drives _________________________________________________________________ Dave Jousma Assistant Vice President, Mainframe Engineering [email protected] 1830 East Paris, Grand Rapids, MI 49546 MD RSCB2H p 616.653.8429 f 616.653.2717 -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Peter Sent: Friday, December 11, 2015 10:28 AM To: [email protected] Subject: Re: Memory for z/OS 2.1 Hi, Is there any cover letter from IBM on the minimal requirement to run z/OS 2.1 ? On Fri, Dec 11, 2015 at 8:55 PM, Vernooij, CP (ITOPT1) - KLM < [email protected]> wrote: > Depends on what you want to run in z/OS. > Until 2 years ago, we ran a Communication Management System with VTAM > and Netview and some other tasks in 1 GB. This was large enough to > avoid paging, so I expect 0.5GB will be sufficient to run z/OS. > > Kees. > > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[email protected]] > On Behalf Of Peter > Sent: 11 December, 2015 16:19 > To: [email protected] > Subject: Memory for z/OS 2.1 > > Hello, > > Could someone please point me on what is the minimum memory > requirement for z/OS 2.1 to run on a z10 box ? > > Peter > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, send > email to [email protected] with the message: INFO IBM-MAIN > ******************************************************** > For information, services and offers, please visit our web site: > http://www.klm.com. 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