IBM Power S1112 9242-21B
IBM Model S1112 9242-21B is the compact rack-entry Power11 system for smaller IBM i, AIX, Linux, branch, and near-edge deployments.
Key Characteristics
- Machine types 9242-21B rack and 9242-21T tower
- 4-core EJMT or 10-core EJSV Power11 processor options
- Up to 512 GB DDR5 across 4 DDIMM slots
- Up to 12.8 TB of internal NVMe U.2 storage
- 4 direct PCIe slots plus optional ENZ0 expansion drawer
- Built-in AI acceleration with Power11 on-chip Matrix Math Acceleration
Workload Fit
- P05 IBM i refresh projects replacing older entry Power hardware
- Branch, remote office, and near-edge deployments needing rack or deskside flexibility
- Mixed IBM i plus Linux or AIX environments where IBM i stays small and other workloads need modern Power11 resources
- Buyers who want current Power11 security, virtualization, and serviceability without stepping into S1122 or S1124 capacity levels
IBM Model S1112 9242-21B is the rack version of IBM's new compact Power11 entry platform, added on July 24, 2026 for smaller on-prem, branch, and edge deployments. It fills the gap below the S1122 by offering a materially smaller footprint, optional tower packaging through the 9242-21T sibling, and a true IBM i P05 entry point inside the current Power11 generation.
For buyers comparing Midland's published S1112 pages against IBM's broader Power11 messaging, the critical takeaway is that the S1112 9242-21B is not simply a cut-down S1122. It is a distinct machine class aimed at smaller IBM i estates, mixed OS branch workloads, and buyers who care as much about footprint, simplicity, and support tier as they do about raw scale.
What makes IBM Model S1112 9242-21B different
Buyer shorthand: the S1112 is the Power11 answer for shops that previously felt forced to choose between waiting on new entry hardware or jumping straight to the larger S1122. It brings current Power11 architecture into a half-width 2U or deskside deployment pattern, while still supporting IBM i, AIX, Linux, and VIOS.
Technical profile
| Area | Confirmed S1112 detail | Why buyers care |
|---|---|---|
| Footprint | One-socket, half-width 2U rack or tower chassis | Lets smaller sites deploy current Power11 without dedicating a full-width data-center footprint. |
| Processor choices | 4-core EJMT at 3.6 to 4.0 GHz or 10-core EJSV at 3.05 to 4.0 GHz | Separates the entry IBM i P05 choice from the mixed-workload P10 option. |
| Memory | Up to 512 GB across 4 DDR5 DDIMM slots | Enough for compact database, ERP, and branch workloads, but far below S1122 territory. |
| Internal NVMe | 4 direct NVMe U.2 positions and up to 12.8 TB raw internal flash | Works well for compact internal storage plans before you step into larger rack systems or external SAN-heavy designs. |
| Direct I/O | 4 direct PCIe slots plus optional ENZ0 expansion drawer support | Gives the box enough adapter room for networking, SAN, tape, or expansion without pretending it is a broad I/O platform. |
| Management | Embedded baseboard management controller plus a dedicated HMC 1 GbE port | Important for smaller environments that still need disciplined PowerVM and service workflows. |
IBM i buyers: where the S1112 fits
The S1112 matters because it creates the first true Power11 path for IBM i Software Tier P05 buyers. Midland's published configuration summaries for both the EJMT and EJSV variants state that IBM i on S1112 remains confined to 4 cores, 64 GB of memory, and 6.4 TB after mirroring, even when the wider platform is configured with additional physical cores or more platform memory. That makes the S1112 a highly focused IBM i machine rather than a broad growth platform for large native IBM i consolidation.
In practical terms, that is excellent news for smaller IBM i estates refreshing older S914 or S1014-class workloads, but it also means buyers should compare the S1122 as soon as their IBM i sizing points toward heavier growth, larger memory appetite, or broader partitioning needs. The S1112 can still make sense in mixed environments because extra platform resources can be applied to Linux, AIX, or VIOS partitions even when IBM i stays inside its S1112 limits.
Supported operating systems and software levels
| Stack | Current level referenced in source material | Planning note |
|---|---|---|
| IBM i | IBM i 7.6 TR2, IBM i 7.5 TR8, IBM i 7.4 TR12 with additional PTFs | IBM's July 2026 IBM i enhancement notes confirm S1112 support for P05 customers. Older IBM i environments should treat the hardware refresh as an OS refresh checkpoint too. |
| AIX | AIX 7.3 TL4 SP1+, AIX 7.3 TL3 SP3+, AIX 7.2 TL5 SP12+ | AIX compatibility should be checked against the specific I/O plan, especially when VIOS is involved. |
| VIOS | VIOS 4.1.1.30 or 4.1.2.10 | Critical for mixed-workload and shared-I/O deployment designs. |
| Linux | RHEL 10.2+, RHEL 9.6+, OpenShift 4.22+, SLES 16+, SLES 15 SP7+ | This is where the 10-core EJSV variant becomes much more interesting than the 4-core IBM i-centric view alone suggests. |
How IBM Model S1112 9242-21B differs from the S1122 9824-22A
| Question | S1112 | S1122 |
|---|---|---|
| Physical stance | Half-width 2U rack or tower | Full-width 2U rack server |
| Processor scale | 4-core or 10-core options | Up to 60 Power11 cores |
| Platform memory | Up to 512 GB | Up to 4 TB |
| IBM i positioning | Entry P05 path and smaller mixed-workload deployments | Broader IBM i growth and denser scale-out consolidation |
| Ideal deployment | Branch, edge, small server room, or deskside modernization | Dense rack-based scale-out in a main server room or data center |
If your main requirement is the smallest current Power11 footprint, the S1112 is the right conversation. If your main requirement is more IBM i growth headroom inside the same generation, the S1122 usually becomes the cleaner comparison.
Configuration pages worth reviewing
S1112 EJMT 4-core
The cleanest IBM i P05 story in the S1112 family. Best for buyers who want the smallest Power11 entry point without paying for mixed-workload headroom they will not use.
S1112 EJSV 10-core
Better for mixed IBM i plus Linux, AIX, or VIOS plans where IBM i remains small but the wider platform needs more aggregate compute and virtualization room.