IBM Parallel Sysplex

https://en.wikipedia.org/wiki/IBM_Parallel_Sysplex

by PaulHoule • 4 years ago

36 10 4 years ago

en.wikipedia.org

worewood• 4 years ago

From my experience working with it: in short, it is just a fancy name for shared memory between machines, with software libraries on top to manage synchronization, distributed transactions, et cetera.

From a sysadmin perspective it behaves less like a "single system image" and more like multiple images with shared resources.

pingsl• 4 years ago

From an app dev perspective, sysplex is very similar to a single system image, especially when they are using the Db2 database.

wmf• 4 years ago

People say IBM mainframes are so reliable that they never fail, yet if a customer wants 5 9s IBM sells them a mainframe cluster.

lboc• 4 years ago

One possible reason why: customers might want to be able to upgrade their hardware/OS/whatever and retain their 5 9s.

js8• 4 years ago

Mainframe itself (the "fridge") is a distributed system, as well as human brain is. It's all the management tooling that makes it appear as a single system.

jlawer• 4 years ago

My understanding that this clustering is more to handle external factors. It allows mainframes to be placed in different buildings anywhere from the same campus to up to 200kms away ideally providing enough distance to deal with natural disasters.

YATA0• 4 years ago

Good luck trying to get five 9s when you're limited to a single DC. Cross-DC SYSPLEXing (GDPS) got us to five 9s and beyond without breaking a sweat. Our systems can never go down, ever.

From VISA with love.

ngcc_hk• 4 years ago

Still remember those days that these are for those transaction processor marketing against mainframe we used. Not in the field. Where they go to ?

mixxit• 4 years ago

WRKSYSSTS

skissane• 4 years ago

That’s IBM i, this is IBM Z

IBM Parallel Sysplex

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