System z High Availability – Value of Parallel Sysplex

1. System z High Availability – Value of Parallel Sysplex David E Brown daveb@us.ibm.com IBM System z z10 EC z10 BC

2. Learning Objectives • High Availability as a Concept • Parallel Sysplex Architecture • Value Of Parallel Sysplex • Data Sharing

3. High Availability as a Concept • High Availability as seen by the end user – Application Driven • Bank Teller • Stock Broker • Internet user • High Availability Metrics

4. High Availability Challenges • Unplanned Outages • Hardware Failure – Servers, Storage, Network • Software Failure – Operating System, Database, etc • Customer Application Failure • Datacenter Disaster • Planned Outages • Hardware Upgrades • Software Upgrades • Data Center Moves

5. Server Clustering -The Challenge

6. If you were the Architect - Server Clustering? Some thoughts All servers can access (read/write) Databases (Serialization of Updates – Data Sharing) All servers can be managed from one console Scalable to very large Capacity Applications can run on all servers Some Servers can be taken out of service (either planned or unplanned) without affecting application availability Servers can run different levels of Operating System and Middleware. ........................................................

7. 12 11 1 2 10 3 9 4 8 5 7 6 Data Sharing – DB/2 Buffer Pool Management DB2Log Log File

8. 12 12 11 11 1 1 2 2 10 10 3 3 9 9 4 4 8 8 5 5 7 7 6 6 Data Sharing - DB/2 Buffer Pool Management DB2Log DB2Log

9. Parallel Sysplex • Hardware • Time Synchronization • I/O Connectivity • Coupling Facility • Software • XCF/XES • WLM • CF Operating - System μ-code (Microcode) • CFCC (Coupling Facility Control Code) NOTE: z/OS and Middleware may be level n, n-1, or n-2. WLM manages workloads across all members of a Parallel Sysplex according to the customers “Business” priorities.

10. Poll Question CFCC runs under z/OS in a CF. (Yes/No)

11. Coupling Technology 12 11 1 10 2 9 3 4 8 7 5 6 Sysplex Timer zSeries System z9 109 ESCON/FICON self managed Shared data Simple! Parallel Sysplex Logoical View Physical View

12. The Link Technology … • Inter System Channel (ISC) • Original Coupling Channel • Provides long distance connections • Internal Coupling (IC) Channel • Fastest coupling performance • Reduced complexity • Increased reliability • Integrated Cluster Bus (ICB) • High bandwidth link for short distance • Fastest interconnection link • Improved processor utilization • PSIFB (Parallel Sysplex Infiniband • Open standards • Very high bandwidth • 6 GB/Sec • Longer distance compared with ICB (150M)

13. Single System Parallel Sysplex 1 to 32 Systems Built In Redundancy Addresses Planned/Unplanned HW/SW Outages Capacity Upgrade on Demand Flexible, Nondisruptive Growth Capacity Backup Scales Hot Pluggable I/O Dynamic Workload/Resource Management Parallel Sysplex Summary Capacity beyond largest CEC

14. Learning Points – System z High Availability Parallel Sysplex is a High Availability Solution implemented via hardware, software, and microcode A Coupling Facility (CF) provides Serialization and buffering Services to members of a Parallel Sysplex – CFCC is the Operating System for all CFs Sysplex Timers (and/or FTP) assures synchronized clocks for all members of a Parallel Sysplex – Required for Data Recovery CF to Server connections can be ISC, ICB, PSIFB, or IC links – IC links are virtual links when CF is LPAR on the same server Parallel Sysplex protects end users from Planned or Unplanned outages WLM manages workloads across all members of a Parallel Sysplex according to the customers “Business” priorities. z/OS and Middleware may be level n, n-1, or n-2.

15. Break Time