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A few years ago BASE24 became available for z/OS, so you can guess the
trend. (That and, I assume, the fact virtually all Western banks
now keep
z/OS and core transaction systems running 24x365. Tandem's raison
d'¾tre,
to keep the ATMs up and queuing limited transactions during nightly or
weekly scheduled outage, no longer applies with modern 24 hour
SLAs. Think
CICS TS/CICSplex, DFSMStvs and others, DB2 data sharing, MQ shared
queues,
IMS HALDB/IMSplex, z/TPF, Sysplex, etc., etc.) Here's some technical
information:
http://www.redbooks.ibm.com/abstracts/sg247268.html
http://www.redbooks.ibm.com/abstracts/redp4337.html
And then there are Japanese ATMs, but that's a digression for
another time.
Timothy,
Thanks for the last entry. In the late 80's (early 90's?) we picked
up a Tandem at the insistence of management. It was put in the data
center and *NEVER* powered up it sat there like all good boat
anchors. I never heard who was responsible for the coming of the the
machine. It must have been high up though or I would have heard. At
the time were were CICS and had IDMS. A few years go by and CICS and
DB2 are there and are still there. Why they needed it was anybodies
guess. But I guess they had to spend money to show the brokerage
houses we were on the spot. We had pretty good uptime, if there was
an "outage" it was a TP issue. I think (I could be wrong) they only
outage we had was an MVS crash and that was for 30 minutes. This was
over 10 years, I worked it out and it was in the 99.99999 range but I
guess that wasn't good enough. There might have been IDMS problems
that I never heard of so the numbers may have been different from the
above. The IDMS DBA's were quite secretive,
Ed
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