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
W dniu 2019-02-25 o 16:52, Mike Smith pisze:
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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