System memory and module capacity
System memory holds the running workload. A module’s capacity is not the complete system total, and a kit can contain several modules. Processor count and memory placement can affect the supported total. Include the installed module labels and occupied slots with a memory request.
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DDIMM, DIMM and ISDIMM memory
DIMM means dual inline memory module. DDIMM means differential DIMM; ISDIMM identifies an industry-standard DIMM in the relevant Power catalog. These descriptions do not establish cross-model compatibility. Match the generation, capacity and exact feature or service part to the target model and its population rules.
S1122 memory: match the exact module options in the Memory panel.
Memory bandwidth and placement
Memory bandwidth describes the rate at which data can move between processors and memory. It is different from memory capacity. Spreading a supported memory population across the required slots can matter to bandwidth; simply fitting the largest modules does not establish the best arrangement.
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Active Memory Mirroring and memory protection
Memory mirroring keeps a second copy for the scope supported by that configuration. The protected scope and resulting usable capacity depend on the model and feature. It is a reliability function, not additional memory capacity for applications.
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PCI, PCIe slots and adapter placement
PCIe is the system expansion connection used by many adapters. Slot generation, lane width and physical profile all matter. Some slots depend on the installed processors or risers. A slot count alone does not establish that the requested adapter fits or runs at its full rated speed.
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CEC, system chassis and external I/O drawers
The central electronics complex, or CEC, contains the main server electronics. An external I/O drawer adds supported expansion positions through its attachment hardware. Keep internal slots, drawer slots and the supported drawer topology separate when comparing system totals.
E1080: keep its per-node slots and external storage limits separate.
NVMe and enterprise or mainstream flash
NVMe is a storage protocol for nonvolatile memory. Mainstream and enterprise labels describe particular supported drive options and endurance classes in the catalog. Capacity alone does not identify the correct drive; its carrier, interface and supported operating-system arrangement also matter.
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SAS, SCSI and RAID attachment
SAS means Serial Attached SCSI. Older systems can use other SCSI connections and different drive formats. A drive must match the backplane or drawer and its controller. RAID protects a configured set of drives, so a raw drive total is different from the space available to applications.
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SFF, LFF, drive carriers and sector formats
SFF and LFF describe small and large drive form factors. The carrier and sector format are additional requirements. A physically similar disk can be unsuitable for the installed controller or IBM i arrangement. Keep the complete drive label and carrier number with a replacement request.
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Fibre Channel adapters and SAN attachment
Fibre Channel is a storage-network connection. Adapter speed, port count and physical profile must match the server and SAN design. The switch, optics and supported storage configuration also matter; a port’s signalling speed is not an application transfer-rate guarantee.
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Ethernet adapters and network attachment
Ethernet connects the server to supported networks. Port count and line speed describe the adapter, while connector type and optics determine the physical connection. RoCE and iWARP identify different RDMA arrangements and should remain attached to their exact adapter options.
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USB, RDX and removable storage
USB describes a peripheral connection. RDX is a removable disk-cartridge system. Match the enclosure, connection and operating-system support before treating a removable device as a backup option. A connection alone does not establish support for a particular backup device.
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Order features, service FRUs and CCINs
An order feature identifies an ordered option. A field-replaceable unit, or FRU, identifies a service replacement. A CCIN is a card identification number used to identify hardware. These numbers can describe related hardware without being interchangeable ordering numbers. Keep their original labels and model context.
S1122 parts: compare the order-feature and service-part columns without exchanging their roles.
Rack units, towers, dimensions and weight
Rack units describe vertical space, while width and depth determine fit and service access. A rack and tower version can have different hardware arrangements. Add rails, installed drawers and the complete configured weight when planning a move or replacement.
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Electrical power, supplies and room cooling
Maximum electrical draw and normal operating consumption answer different planning questions. The installed processors, drives and expansion drawers affect the total. We check the actual power supplies, voltage, outlets and PDU connections with the room’s cooling and service clearance.
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Redundancy and availability features
Redundant supplies, protected memory and serviceable components reduce specific failure risks. They do not establish that every part can be replaced while applications run. Match each availability feature to the exact system configuration and service procedure.
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Warranty, maintenance and support levels
A base warranty, hardware maintenance and an enhanced support level are different service arrangements. Their coverage depends on the serial number and applicable terms. A published original warranty does not establish remaining coverage on a used system.
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MES upgrades and configuration-dependent limits
An upgrade can depend on the existing machine type, serial number and installed features. Processor, memory and I/O changes can have linked requirements. Send the current configuration and intended change so we can check the complete upgrade rather than matching a single number.
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Storage capacity and I/O configuration
Storage specifications describe the drives and supported expansion that hold data. I/O specifications describe how the server reaches that storage and its networks. Keep internal bays, external drawers and adapter limits separate. The selected operating system and native or virtual I/O arrangement can change which options apply.
Compare the model configurations or discuss your installed system.
IBM i disk mirroring and storage protection
Disk mirroring keeps matching data copies on the configured storage devices. The protected usable capacity differs from a sum of drive capacities. A model’s mirrored-storage limit belongs to its stated IBM i and controller arrangement; it is separate from Active Memory Mirroring.
Compare the model configurations or discuss your installed system.