On 21 Jan 2012 08:07:01 -0800, in bit.listserv.ibm-main you wrote: >On 01/21/2012 07:54 AM, Peter Relson wrote: >>> how does IBM suggest doing a compress on a Linklist lib that needs >>> compressing, inquiring minds would love to know >> >> There is no suggestion. This is simply not an operation that is supported >> or can be supported in general. >> >> Peter Relson >> z/OS Core Technology Design >> > >So the only functionally-equivalent, officially-sanctioned way to >accomplish this goal is still to >(1) create a new dataset with a different name and copy the data to it, >(2) modify PARMLIB LNKLST defs to replace the old library in linklist >with the new at next IPL, >(3) IPL. >And if for some reason you really must have the original dataset name, >repeat the process to get back to the old name. > >All the other techniques that have been described here in the past to >achieve this and bypass or defer the need for an IPL either don't >guarantee the new library will be seen by all address spaces or carry >some risk. While those of us who have been around long enough are >fairly certain of specific cases at our own installation where the risks >of alternative methods are small enough and acceptable, it is >understandable that IBM does not wish to "endorse" techniques whose >success depends on SysProg competence and judgement and also in many >cases upon the tacit cooperation of Murphy in keeping unrelated system >failures from occurring in a narrow transition window during which >libraries and PARMLIB might be in a state where successful IPL and >recovery from system failure is not be possible (without an independent >z/OS recovery system).
This discussion reminds me of when I was in a shop that had both Tandem and an IBM mainframe. The notice for a systems maintenance upgrade on the Tandem was that the operator would institute a simple procedure at a specific time with no outage. I think at one time IBM owned a computer company (Sequent?) that claimed to be able to do the same thing. I know that I was impressed by the Tandem capability. Clark Morris ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: INFO IBM-MAIN
