Episode 22 "Great App-spectations"

Here are the show notes for Episode 22 “Great App-spectations”. The show is called this because we talk about app expections in our Topics topic.

View WTOR and HOLD messages in a separate window
Visible console name part
Overall: These two function areas help you manage your z/OSMF operator consoles better.

Performance: Paging Subsystem Design in an age of Virtual Flash
Performance: Paging Subsystem Design in an age of Virtual Flash

Question from customer about need for paging space if Flash installed , which was answered in Martin’s blog post, but there is more thinking about this.
Look at the paging subsystem design in the round, with two flavours of Flash: FlashExpress (PCIE) and VFM
Design standpoint ideally as if no Flash
Paging subsystem design: Two main considerations: Space and Performance
Come together in “30% Contiguous Slot Allocation Algorithm breakdown” rule of thumb
Instrumentation
RMF SMF 71, also covers memory. Flash treated like ordinary paging device.
RMF SMF 74-10 in OA50761
Wrap up: Paging subsystem design still worthy of care, and establish whether risk of Flash or Virtual Flash warrants conservative configuration of paging subsystem.

Topics: Anatomy Of A Great App

“App” here means “third party software” but we’ll say app for short

Highly biased on expectations in iOS, as Martin is a power user.
Marna gave the Android perspective
z/OS perspective was discussed.
Conclusion: Think about more than just what your app is supposed to do. Nobody wants software whose function they like but they hate using. It is way too easy to uninstall an app (or have hundreds of them and not use them).
Keep to the “Principle of least astonishment”.

You can reach Marna on Twitter as mwalle and by email.

You can reach Martin on Twitter as martinpacker and by email and blogs at blog.