External IO subsystems- IBM Power E1050

If more PCIe slots beyond the system node slots are required, the Power E1050 server supports adding I/O expansion drawers.

If you need more disks than are available with the internal disk bays, you can attach external disk subsystems that can be attached to the Power E1050 server, such as:
Ê EXP24SX SAS Storage Enclosure Ê IBM System Storage

Note: The existing EXP12SX SAS Storage Enclosure (#ESLL) is still supported. Earlier storage enclosures like the EXP12S SAS Drawer (#5886) and EXP24 SCSI Disk Drawer (#5786) are not supported on the Power E1050.

3.9.1 PCIe Gen3 I/O expansion drawer

This 19-inch, 4U (4 EIA) enclosure provides PCIe Gen3 slots outside of the system unit. It has two module bays. One 6-slot fanout module (#EMXH) can be placed in each module bay. Two 6-slot modules provide a total of 12 PCIe Gen3 slots. Each fanout module is connected to a PCIe3 Optical Cable adapter that is in the system unit over an Active Optical Cable (AOC) pair or a CXP copper cable pair.

The PCIe Gen3 I/O Expansion Drawer has two redundant, hot-plug power supplies. Each power supply has its own separately ordered power cord. The two power cords plug in to a power supply conduit that connects to the power supply. The single-phase AC power supply is rated at 1030 W and can use 100 – 120 V or 200 – 240 V. If using 100 – 120 V, then the maximum is 950 W. It is a best practice that the power supply connects to a power distribution unit (PDU) in the rack. Power Systems PDUs are designed for a 200 – 240 V electrical source.

The drawer has fixed rails that can accommodate racks with depths 27.5″ (69.9 cm) – 30.5″ (77.5 cm).

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Attention: #EMX0 has a cable management bracket at the rear of the drawer that swings up to provide service access to the PCIe adapters. 2U (2 EIA) of space is required to swing up the bracket. Thus, the drawer cannot be placed at the top 2U of a rack. There is a power cord access consideration with vertically mounted PDUs on the right side of the rack when viewed from the rear of the rack. The #EMX0 cable management bracket makes accessing some of the PDU outlets at the same rack height as the #EMX0 drawer more challenging. Using a horizontally mounted PDU or placing the PDU or #EMX0 at a different vertical location is recommended.

A BSC is used to house the full-height adapters that go into these slots. The BSC is the same BSC that is used with the previous generation server’s 12X attached I/O drawers (#5802, #5803, #5877, and #5873). The drawer includes a full set of BSCs, even if the BSCs are empty.

Concurrent repair, and adding or removing PCIe adapters is done by HMC-guided menus or by OS support utilities.

Figure 3-3 shows a PCIe Gen3 I/O expansion drawer.

Figure 3-3 PCIe Gen3 I/O expansion drawer

Figure 3-4 shows the back view of the PCIe Gen3 I/O expansion drawer.

Figure 3-4 Rear view of the PCIe Gen3 I/O expansion drawer

I/O drawers and usable PCI slots

Figure 3-5 shows the rear view of the PCIe Gen3 I/O expansion drawer that is equipped with two PCIe3 6-slot fanout modules with the location codes for the PCIe adapter slots.

Figure 3-5 Rear view of a PCIe Gen3 I/O expansion drawer with PCIe slots location codes

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Table 3-20 provides details about the PCI slots in the PCIe Gen3 I/O expansion drawer that is equipped with two PCIe3 6-slot fanout modules.

Table 3-20 PCIe slot locations for the PCIe Gen3 I/O expansion drawer with two fanout modules

Ê All slots support full-length, full-height adapters or short (LP) adapters with a full-height tailstock in a single-wide, Gen3 BSC.
Ê Slots C1 and C4 in each PCIe3 6-slot fanout module are x16 PCIe3 buses, and slots C2, C3, C5, and C6 are x8 PCIe buses.
Ê All slots support enhanced error handling (EEH).
Ê All PCIe slots are hot-swappable and support concurrent maintenance.

Table 3-21 summarizes the maximum number of I/O drawers that are supported and the total number of PCI slots that are available.

Table 3-21 Maximum number of I/O drawers that are supported and total number of PCI slots