memory – Mainframe, Performance, Topics

Memories Are Made Of This

Wouldn’t you like to know where in the machine an LPAR’s memory is? Perhaps not but for some customers it’s more than a matter of idle curiosity. The good news is that RMF will be able to tell you: A recent APAR for z/OS 3.2 Data Gatherer OA68545 exploits information from z17 processors to provideContinue reading “Memories Are Made Of This”

Remember Memory

In Engineering – Part 8 – Remote Access Detection I talked about reasons why LPARs might go cross-drawer. One reason I didn’t give was about memory. (I should perhaps remind you that on modern machines a logical processor accessing Level 4 Cache or memory in another processor drawer incurs a significant performance penalty, showing upContinue reading “Remember Memory”