Dual-port 25 Gbps Ethernet (RoCE) host interface adapter
The dual-port 25 Gbps Ethernet (RoCE) adapter provides two Ethernet port connections capable of running at 25 Gbps.
The ports can also work at 10 Gbps when a 10 Gbps transceiver module is fitted. The ports can auto-negotiate to 10 Gbps only when non-optical transceiver modules are used.
25 Gbps Ethernet ports can be used for:
- Host connections by using iSCSI, NVMe/TCP, or NVMe-RoCE
- IP Replication links
Connections can be made via a Ethernet switch, or as a direct connection to a host or other FlashSystem controller. Use of the NVMe-RoCE protocol requires RoCE-compatible Ethernet switches.
Ethernet ports are numbered from 1 to 4, starting from the left (horizontal placement) or top (vertical placement). Figure 2 shows ports and their indicators.
- 1 Ethernet port (2-port card)
- 2 Status LED (port 1)
- 3 Status LED (port 2)
Each port has an SFP+ receptacle, and a number of physical connection types supported:
| Connection type | Supply method | Part number (examples for customer-supplied parts) |
|---|---|---|
| Optical Shortwave SFP28 Module - 25 Gb | IBM Orderable Feature | 78P5153 |
| Optical Shortwave SFP+ Module – 10 Gb | IBM Orderable Feature | 78P1661 |
| Copper 10BASE-T RJ45 Module - 10 Gb | IBM Orderable Feature | 45W2412 |
| 25 Gbps DAC passive copper cable | Customer supplied | Mellanox MCP2M00-A003 |
| QSFP28 to SFP28 passive Twinax copper cable (100 Gbps to 25 Gb) | Customer supplied | Cisco QSFP-4SFP25G-CU3MMellanox - MCP7F00-A002R |
| 10 Gbps DAC passive copper cable | Customer supplied | Cisco SFP-H10GB-CU3m |
| QSFP+ to SFP+ splitter cable (40 Gbps to 10 Gb) | Customer supplied | Mellanox MC2609125-005 |
For more information, see Dual-port 25 Gbps Ethernet host interface adapter ports and indicators.