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You are correct, the OS is patched regularly but that doesn't require a recompile for the COBOL code, the OS ABI is stable and unchanging for legacy code. I ha
by cwbriscoe 2y ago
You are correct, the OS is patched regularly but that doesn't require a recompile for the COBOL code, the OS ABI is stable and unchanging for legacy code. I have programs still running that hasn't been recompiled since 2005 (maybe earlier that is just what I noticed recently). When they upgrade hardware, they can do it per LPAR. They just shift the workloads over to other LPARS while they are upgrading another. Pretty much zero downtime.
- p_l 2y agoYep. CICS, IMS, etc. all get updates along with z/OS itself, yet I had once plugged in an user exit written and compiled before 64bit z/OS existed and it just worked.