IBM has published a number of very interesting documents about their System z platform. Find them at http://www.redbooks.ibm.com.
Find additional in-depth technical documentation about the kernel and application topics on IBM System z with SUSE Linux Enterprise Server at the following location:
For a first glance at the technical details of some systems, refer to:
IBM System z10 Enterprise Class Technical Introduction (SG24-7515)
IBM System z9 Business Class Technical Introduction (SG24-7241)
IBM eServer zSeries 990 Technical Introduction (SG24-6863)
IBM eServer zSeries 900: Technical Guide (SG24-5975)
Linux on zSeries Fibre Channel Protocol Implementation Guide (SG24-6344)
A general coverage of Linux on IBM System z can be found in the following documents:
Linux on IBM eServer zSeries and S/390: ISP and ASP Solutions (SG24-6299)
These documents might not reflect the current state of Linux, but the principles of Linux deployment outlined there remain accurate.
Refer to the following documents to get in-depth technical information about the Linux kernel and application topics. Refer to the Internet for up-to-date versions of these documents for the most recent code drop (http://www.ibm.com/developerworks/linux/linux390/index.html).
Linux on System z Device Drivers, Features, and Commands
zSeries ELF Application Binary Interface Supplement
Linux on System z Device Drivers, Using the Dump Tools
IBM System z9-109 Technical Introduction (SG26-6669)
IBM System z10 Enterprise Class Technical Guide (SG24-7516)
There also is a Redbook for Linux application development on http://www.redbooks.ibm.com:
Linux on IBM eServer zSeries and S/390: Application Development (SG24-6807)
Refer to the following Redbooks, Redpapers, and links for some more complex IBM System z scenarios:
Linux on IBM eServer zSeries and S/390: Large Scale Deployment (SG24-6824)
Linux on IBM eServer zSeries and S/390: Performance Measuring and Tuning (SG24-6926)
Linux with zSeries and ESS: Essentials (SG24-7025)
IBM TotalStorage Enterprise Storage Server Implementing ESS Copy Services with IBM eServer zSeries (SG24-5680)
Linux on IBM zSeries and S/390: High Availability for z/VM and Linux (REDP-0220)
Saved Segments Planning and Administration
Linux on System z documentation for "Development stream"
http://www.ibm.com/developerworks/linux/linux390/development_documentation.html