W dniu 2012-04-27 23:03, John McDowell pisze:
I'm trying to get a feel for problems that occur in the early stages of z/OS
system start up (e.g. IPL/NIP). Generally problems in these stages result in a
non-restartable wait state, for example wait state x'0B1' (e.g. LOADxx or IODF
problem).
Questions:
1. FREQUENCY: How often do they occur ?
2. DURATION: How long does it take to resolve them (e.g. minutes, hours, etc.)
?
3. IMPACT: What are the consequences (e.g. missed SLAs, etc.) ?
4. CAUSE: What are the underlying sources (e.g. hardware, software, etc.) ?
5. RECOVERY: How do you recover from them ?
1. Rarely. IPL is performed rarely. In my case I haven't noticed such
problem *on production systems* for years. Such problems do happen
during tests, like new system, PTFs applied (and IPLTEXT not refreshed),
new CPC, new LPAR, DR test, etc.
BTW: I *hate* looking at last 3 digits, then previous digits... ;-)
Since the numbers are available on HMC, it would be nice to have button
Explain which could (under the covers) open the book and perform the
analysis for me.
2. The time depends on two-three elements:
a) time to open the book. It can be few seconds when I'm on my PC (HMC
accessed remotely), it can be minutes when I do it on real HMC and I
have to use another PC for documentation access.
b) time to write down the digits, extract wait state code and reason code.
c) (optional) sometimes I need to check whether description is accurate
or maybe fix something (like LOAD member). I usually logon to TSO on
another system and view/modify the things. It could take 5 min.
3. Lost time, some stress. From business point of view it doesn't affect
my SLA.
4. IODF in multiple extents, OS config with bad offline/online device
set (i.e. IODF device is described as OFFLINE YES), mistakes in LOADxx,
not refreshed IPLTEXT (after PTF APPLY), typo in LOAD window on HMC.
5. See 2.
Regards
--
Radoslaw Skorupka
Lodz, Poland
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