IBM zEnterprise EC12

zEnterprise® EC12 (2827)
Processor Core Types: CP/IFL/ICF/zAAP*/zIIP*
Model Minimum Maximum
H20 1 / 0 / 0 / 0 / 0 20 / 20 / 20 / 10 / 10
H43 1 / 0 / 0 / 0 / 0 43 / 43 / 43 / 21 / 21
H66 1 / 0 / 0 / 0 / 0 66 / 66 / 66 / 33 / 33
H89 1 / 0 / 0 / 0 / 0 89 / 89 / 89 / 44 / 44
HA1 1 / 0 / 0 / 0 / 0 101 / 101 / 101 / 50 / 50
Coupling Links
IC maximum 32
ISC-3 maximum 48
12x InfiniBand maximum 32 ports§
12x InfiniBand maximum 32 ports§
1x InfiniBand maximum 64 ports§
FICON Express8S / FICON Express8 / FICON Express4 / OSA-Express5S / OSA-Express4S / OSA-Express3 Minimum: 0 / 0 / 0 / 0 / 0 / 0 Maximum: 320 / 176 / 176 / 96 / 96 / 96
Flash Express 8 (4 pairs – 8 PCIe adapters); offered in pairs
HiperSockets™ Up to 32 high-speed “virtual” Local Area Networks
Crypto Express4S Minimum order 2 features; Max is 16 features
Crypto Express3 Minimum order 2 features; Max is 8 features
Compression Acceleration
zEDC Express 8 – minimum recommended is 2
RDMA over Converged Ethernet (RoCE)
10GbE RoCE Express 16 – minimum recommended is 2 per LPAR
Processor Memory
Model Minimum Maximum
H20 32 GB 704** GB
H43 32 GB 1392 GB
H66 32 GB 2272 GB
H89 32 GB 3040 GB
HA1 32 GB 3040 GB
  Upgradeable within the zEC12 family
  Upgrading to the HA1 from other zEC12 models will require a planned outage
  Upgradeable from IBM zEnterprise BC12 (zBC12) to zEC12 H20, IBM zEnterprise 196 (z196) and IBM System z10® Enterprise Class
Supported Operating Systems
z/OS z/OS V2.1
z/OS V1.12, V1.13 or higher
z/OS V1.11, V1.10 Lifecycle Extension
z/VM VM V5.4, 6.1, 6.2 with PTFs, and subsequent releases.
z/VM V6.1, 6.2 and subsequent releases for zBX support
Linux on System z Red Hat Enterprise Linux (RHEL) 5 and subsequent releases, SUSE Linux Enterprise Server (SLES) 11 SP3 and SLES 10 (SP4)
z/VSE z/VSE V4.3 with PTFs
z/VSE V5.1 with PTFs and subsequent releases
z/TPF z/TPF 1.1
AIX (on POWER7 blade located in IBM BladeCenter Extension Mod 003) AIX 5.3, AIX 6.1 and AIX 7.1 and subsequent releases and PowerVM® Enterprise Edition
Linux on System x (on IBM BladeCenter HX5 blade installed in zBX Mod 003) Red Hat RHEL 5.5 and up, 6.0 and up and SUSE Linux Enterprise Server (SLES) 10 (SP4) and up, SLES 11 SP1 and up – 64 bit only
Microsoft Windows (on IBM BladeCenter HX5 blades installed in ZBX Mod 003)†† Microsoft Windows Server 2012, Microsoft Windows Server 2008 R2 and Microsoft Windows Server 2008 (SP2) (Datacenter Edition recommended) – 64 bit only
IBM zEnterprise BladeCenter Extension (zBX) Model 003
WebSphere DataPower Integration Appliance XI50 for zEnterprise Minimum: 0 Maximum: 28‡‡
IBM BladeCenter PS701 Express blade Minimum: 0 Maximum: 112‡‡
IBM BladeCenter HX5 blade Minimum: 0 Maximum: 56‡‡
IBM BladeCenter PS701 Express blades installed in zBX Model 03 PowerVM Enterprise Edition VIOS 2.2.
IBM BladeCenter HX5 (7873) blades installed in zBX Model 03 KVM Red Hat Enterprise Virtualization Hypervisor (RHEV-H) 6.4

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IBM provides world-class IBM mainframe technology to help today's enterprises respond quickly to evolving business conditions and with extreme flexibility. From automation to advanced virtualization technologies and open industry standards, IBM mainframes help deliver competitive advantages for enterprises contributing and succeeding on a smarter planet.

Operating Systems

IBM System z supports multiple operation systems:


IBM's technology, solutions and industry expertise can help you find the competitive edge with a sharper understanding of your customers. Our System z solutions combine the foundation of IBM hardware, software and middleware with flexible financing and packaging options to help your business meet and overcome the challenges of doing business in the on demand world. IBM can help you develop a customer-centric view—and assist you in delivering the right solution and the right products.

zEnterprise innovations

  • New features bring even greater business benefit.

Technical advantages of the IBM zEnterprise EC12

  • IBM technical experts describe two new technologies available with the IBM zEC12 - IBM zAware and Flash Express

zEnterprise EC12 walk-through demo

zEC12 analyst papers

Clabby Analytics: "The IBM zEnterprise EC12: A Technology/Strategy Review" (PDF, 403KB)

Industry analyst Joe Clabby looks at the new IBM zEnterprise EC12 from the perspectives of technology, strategy and pricing.

ITIC: IBM zEnterprise EC12 Servers Deliver Near-Flawless Reliability, Security (PDF, 251KB)

ITIC reports that the zEC12 provides clients with the processing power, performance and near-flawless reliability and security necessary for the most demanding workloads.

More zEC12 analyst papers

IDC: "IBM zAware uses Predictive Analytics and Big Data technology to manage z/OS Workloads" (PDF, 124KB)
This report by IDC discusses IBM zAware, a key feature of the zEnterprise EC12 that analyzes internal system messages to identify unusual system behavior.

Independent Assessment: zEnterprise BladeCenter Extension (zBX): the Case for Adopting Hybrid Computing (PDF, 517KB)
This paper by Independent Assessment analyst Alan Radding describes the process and benefits of hybrid computing with IBM zEnterprise and zEnterprise BladeCenter Extension (zBX).

MacFarland Consulting: "What the IBM zEnterprise EC12 Brings to Business Operations" (PDF, 594KB)
This MacFarland Consulting report examines how the new capabilities of the zEC12 support large enterprise business operations.

Ptak, Noel & Associates, "IBM’s Latest Mainframe, Another Winner" (PDF, 221KB)
This report on the zEnterprise EC12 by IT analyst firm Ptak, Noel & Associates asserts that IBM’s latest System z model clearly demonstrates the mainframe is very much alive and kicking.

Pund-IT Research: "IBM’s zEC12 as a Foundation for Smart, Enterprise-Class Computing" (PDF, 283KB)
This Pund-IT research paper looks into zEC12's advances in performance, scalability, security, cloud and hybrid computing that make an ideal platform for enterprise computing.

Robert Frances Group: zEnterprise Update (PDF, 210KB)
This report by Robert Frances Group asserts that the new zEC12 is another proof point that IBM mainframes are highly viable offerings, capable of meeting the critical business needs of both today and tomorrow.

The Clipper Group: "The zEnterprise Hybrid Model — Where Goest Thou?" (PDF, 840KB)
This paper by Clipper Group looks at how the zEnterprise EC12 extends zEnterprise's hybrid capabilities.

The Clipper Group: The IBM zEnterprise EC12 — Bigger, Better, Faster (PDF, 1MB)
The Clipper Group looks at how the IBM zEC12 brings new capabilities for new workloads and continues the evolution of the zEnterprise hybrid computing system.