Skip to main content

IBM System z9 Enterprise Class

Formerly IBM System z9 109 (z9-109)

Tab navigation


A "classic" might just be the best

The System z9 Enterprise Class (z9 EC) continues to be a leader in areas such as data management, availability, security and resiliency, virtualization and integration. Features such as enhanced book availability, redundant I/O interconnect and enhanced driver maintenance can increase the z9 EC’s availability, helping to protect not just the mainframe but also its applications from unplanned as well as planned outages. By participating in IBM’s Parallel Sysplex® technology, the z9 EC can offer the flexibility to solve business issues, such as having rapid response when business needs change, providing near-continuous availability of IT assets and helping to reduce the overall cost of computing.

While the z9 EC can scale to offer a large capacity mainframe in a single footprint, some customers have requested the z9 EC innovative features with more flexibility in customizing and sizing the capacity of the general purposes processors (CPs) that reside in the server. These customers want more options as they weigh business demands and costs, trying to achieve the right balance. The subcapacity models of the z9 EC satisfy these requests.

The z9 EC, like the predecessor IBM mainframes, includes dedicated I/O processors (the System Assist Processor or SAP) to manage thousands of concurrent data accesses. It provides more available channel bandwidth and FICON channels than the IBM eServer™ zSeries® 990 (z990). The new MIDAW Facility on the z9 EC can help improve FICON channel efficiency and throughput, especially with the new FICON Express4. The tight collaboration the z9 EC has with IBM storage and IBM software helps achieve further advanced I/O function and performance.

The z9 EC continues to extend and support the use of dedicated processors for specialized workloads, which can help provide better optimization of resources as well as offer price/performance improvements to users. The server’s ability to support many open and industry standards, with comprehensive support for Service-Oriented Architecture, makes it an ideal platform for deploying new workloads or for interoperating with new workloads on alternative technologies. These enhanced capabilities illustrate that the z9 EC is a classic that doubles as an advanced solution designed to support the IT infrastructure needed for today’s on demand business. IBM System z9-Powerful servers for simplified infrastructures.

Benefits Features/functions
Capacity on Demand
Specialty Engines
I/O Connectivity
Cluster systems

Processor Unit (PU) types: CP/IFL/ICF/zAAP5
Model Minimum Maximum Increments
S08 1/1/1/0/0 8/8/8/4/4 1/1/1/1/1
S18 1/1/1/0/0 18/18/16/9/9 1/1/1/1/1
S28 1/1/1/0/0 28/28/16/14/14 1/1/1/1/1
S38 1/1/1/0/0 38/38/16/19/19 1/1/1/1/1
S54 1/1/1/0/0 54/54/16/27/27 1/1/1/1/1
Coupling Links
ISC-3 48
IC 32
ICB-3 16
ICB-4 16
Max # Links 641
Minimum 0/0/0/0/0/0/0 ESCON/FICON Express4/FICON Express2/FICON
Maximum 1024/336/336 /120/48/48/16 ESCON/FICON Express4/FICON Express2/FICON
Increments 4/4/4/2/2/2/1/1 ESCON/FICON Express4/FICON Express2/FICON
Express/OSA-Express2/OSA-Express – GbE, 1000BASE-T/OSA-Express2 – 10 GbE/HiperSockets
Cryptographic4 Crypto Express 2 – optional up to 8 features (16 PCI-X adapters), minimum order is 2 features
Processor memory
Model Minimum Maximum
S08 16 GB 128 GB
S18 16 GB 256 GB
S28 16 GB 384 GB
S38 16 GB 512 GB
S54 16 GB 512 GB
Upgradeability Upgradeable within the z9 EC family
Upgrading to the S54 from other z9 EC models will require a planned outage
Upgradeable from IBM eServer zSeries 900 (z900), z990 and IBM System z9 Business Class (z9 BC) Model S07
Physical Configuration Model S08, minimum2 Model S38, maximum3
Weight 1212 kg (2672 lbs) 2003 kg (4407 lbs)
Footprint 2.49 Sq meters (26.78 Sq. ft) 2.49 Sq. meters (26.78 Sq. ft)
Service 5.45 Sq meters (58.69 Sq. ft) 5.45 Sq. meters (58.69 Sq. ft)
Input 6.3 kW 18.3 kW
Heat 21.5 KBTU/hr 62.4 KBTU/hr
Air CFM 905, m3/m CFM 1965, m3/m
Height 194.1 cm (76.4 inches) 194.1 cm (76.4 inches)
General Conforms to EIA guidelines for frames
z/OS: z/OS 1.6 and subsequent releases
z/VM: z/VM 5.1 and subsequent releases
Linux on System z: Red Hat RHEL 4 and subsequent releases, SUSE SLES 9 and subsequent releases, Linux as z/VM guest
z/VSE: z/VSE V3.1, V4.1
TPF: TPF 4.1
z/TPF: zTPF 1.1

1 64 external and 32 internal
2 Model S08 with one I/O cage and no IBF
3 Model S38 with three I/O cages and IBF with a combined max. of 64
4 Initial order of Crypto Express2 requires 2 features, maximum of 8 features
5 If ordering a zAAP or a zIIP, one or more general purpose processor (CP) per the specialty engine is required. One general purpose processor can satisfy the requirement for either or both of the specialty engines.

Contact IBM

Easy ways to get the answers you need.

or call IBM at
+32-(0)78-15 54 73