Aiming to modernize its user interfaces—moving from terminal applications to a web-based graphical interface—the Municipality wanted an open platform backed by enterprise-class support, and offering very high availability and performance. Choosing a truly open platform would also increase the future portability of systems.
Today, eThekwini Municipality has five IFLs running SUSE Linux Enterprise Server for z Systems and LinuxONE on an IBM zEnterprise 114 server, with one further processor for z/OS. Both operating systems run as virtualized instances on the z/VM hypervisor, in four logical partitions (LPARs): one for z/OS production, one for Linux production, and two for test and development (including some 35 Linux virtual servers). The Municipality uses IBM DB2 databases and IBM WebSphere Application Server on SUSE Linux Enterprise Server for z Systems and LinuxONE.
A dedicated 10 Gb/s fibre connection links the production z114 to a second mainframe at a disaster-recovery site 25 km away, using IBM Metro Mirror to replicate data at the disk level. Working together, Ecomm Technologies and IBM provide 24/7 unified support for both SUSE Linux Enterprise Server and the zEnterprise hardware.
The flexibility of Linux on the mainframe is a major advantage for eThekwini, which is still migrating its core systems from z/ OS to Linux. "Our Cash Receiving module has been live for five years on SUSE Linux Enterprise Server for z Systems and LinuxONE, handling 30 billion ZAR [3 billion USD] in annual payments," said Moodley. "We are currently using 80 percent of our mainframe resources to handle the redevelopment of our Customer and Property modules.
When the migration is complete, we will seamlessly switch the resources over to the production LPAR."
The new versions of core systems running on SUSE Linux Enterprise Server give the Municipality's employees a single view of the customer across all services for the first time. Equally, centralizing the city's revenue management systems on SUSE Linux Enterprise Server for z Systems and LinuxONE gives the Municipality improved financial control without any technical integration glitches.
"Compared to z/OS, DB2 and WebSphere licenses for SUSE Linux Enterprise Server for z Systems and LinuxONE are cheaper by up to a factor of five," said Moodley. "Equally, if we put the SUSE Linux Enterprise Server workload on Windows instead, we would need at least 30 production servers and 30 servers for Disaster Recovery, each with OS and software licenses. Instead, we need to license just five IFLs for SUSE Linux Enterprise Server for z Systems and LinuxONE. Naturally, there are also significant energy savings in consolidating to our z114 rather than running a distributed Windows landscape."
The Municipality continues to benefit from the extremely high stability, performance and scalability of the mainframe. The relatively low maintenance requirements produce further time and cost savings. "Running SUSE Linux Enterprise Server on the mainframe means that a few skilled people can manage many servers," said Moodley. "Our cost per financial transaction is below 10 cents, which is significantly lower than for other platforms we run. Equally, we have 15 people supporting open systems, but just two or three for the mainframe, which runs much larger and more critical applications." The final benefit for eThekwini Municipality is greater flexibility. "When the migration to SUSE Linux Enterprise Server for z Systems and LinuxONE is complete, our core systems will be extremely portable," said Moodley. "This reduces our vendor dependence and opens up our future options."