AppliedPlatform32 min
Parallel Sysplex
How several z/OS systems act as one: XCF and couple data sets, the coupling facility and its lock, cache and list structures, shared time, Db2/IMS/VSAM/MQ data sharing, rolling IPLs, GDPS at concept level, and the problems you will meet on call.
What you will be able to do
- Explain the difference between a base sysplex and a Parallel Sysplex, and what XCF and couple data sets do
- Describe the coupling facility, its lock, cache and list structures, and which products use each
- Explain how workload balancing and rolling IPLs give continuous availability, and where GDPS fits
- Recognise common sysplex problems and the first displays to check
Lessons
- From one system to many: sysplex, XCF and couple data setsA sysplex is a group of z/OS systems that cooperate as one. XCF lets them send messages to each other and notice when one fails, couple data sets hold the shared records that…
- The coupling facility and data sharingThe coupling facility is a special LPAR that holds shared lock, cache and list structures in fast memory. Db2, IMS, VSAM RLS and MQ use those structures so that programs on…
- Continuous availability: balancing, rolling IPLs, GDPS and common problemsBecause work can run on any system, a Parallel Sysplex can spread load, survive the loss of one system and take systems down one at a time for maintenance. GDPS extends this…
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