IBM z/OS’s Microscope – GTF
With a GTF I/O summary trace, what appears innocuous at the RMF level can have some surprising characteristics when put under the GTF microscope.
Shelfware, IT’s version of Home Exercise Equipment
Unused software, or shelfware, is a pervasive problem in enterprise IT as it doesn't take other factors like personnel, processes, and skills into account.
How are my Disk Storage Systems doin’?
Disk storage systems provide hundreds of performance-related metrics but in order to identify which of the metrics are key, one first needs to know what exactly the metric represents.
Pend Time Haiku
The I/O infrastructure for IBM z Systems is second to none in the enterprise space, including the detailed metrics delineating where time is spent in I/O processing.
The Attack of the Disk Clones
While most mainframe shops have explored how to reduce mainframe software costs, we are finding significant latent savings opportunities still exist at even the best run sites.
Beneficial Use of GDPS Copy Once Facility (Experimental Evidence)
A Copy Once Facility is not expensive to implement or maintain and can save up to 50% of the bandwidth that would be required if it wasn’t available.
Four Steps You Should Take to Identify, Resolve and Prevent IBM SVC Front-End Imbalance
This blog provides you with further options when distributing workloads across the available resources and dedicating replication traffic to specific ports.
Eliminating Data Set Contention
This blog discusses how disk storage systems exhibiting excess device busy delay times can be resolved.
Performance Modeling for Disk Storage Systems
This blog demonstrates how computer system performance modeling is done, specifically for disk storage systems.