Network adapter for the private interface for RAC

Hi guys
This is the specification for the Network adapter for the private interface in RAC:
The network adapter for the private interface must support the user datagram protocol (UDP) using high-speed network adapters and a network switch that supports TCP/IP (Gigabit Ethernet or better).
Do you have a document where I can have more deep details about it ?
Thanks

user2931261 wrote:
This is the specification for the Network adapter for the private interface in RAC:
The network adapter for the private interface must support the user datagram protocol (UDP) using high-speed network adapters and a network switch that supports TCP/IP (Gigabit Ethernet or better).Note that TCP is also used in addition to UDP over the Interconnect. As for the statement that the NIC must support UDP - wrong statement to make. The NIC does not support UDP. The IP (Internet Protocol) stack does. The NIC supports the bottom layer of the ISO model. UDP is at layer 4.
As for your Interconnect, you have two basic choices. Gigabyte Ethernet or Infiniband.
For GigE you need of course a GigE NIC and a GigE switch, and a cable to wire the NIC into the switch.
For Infiniband you need a HCA card (e.g. Mellanox InfiniHost PCI card) and an Infiniband switch. As HCA cards are dual port, it make sense to get 2 cables and wire both ports into the switch and bond those 2 ports as a single logical NIC. You can run IPoIB (IP over Infiniband), which means that the 2 ports on the HCA will be seen by the o/s as NICs - and bonding is supported which enables you to create a single logical NIC on top of these 2 NICs and thus have full redundancy.
Also note that GigE typically is only 1Gb/s. 10 Gb/s is available, but expensive (especially the switch). Infiniband typically is QDR rate today that provides you with 40Gb/s pipes. So each port on the HCA will be 40Gb and the bonded port will thus be 2x40Gb/s.
Infiniband is a lot faster and more scalable for an Interconnect than GigE.
Also, because of the capacity and flexibility and low latency of Infiniband, you can also use it for your storage fabric layer (running your storage protocol over it).
Typically you will need to get HBA cards (dual fibre port) to wire the RAC node to the storage array's fibre channel switch. These HBA ports are 2Gb/s.
You can eliminate these HBAs and fibre cables by using a storage protocol like SRP (Scsi RDMA Protocol - RDMA=Remote Direct Memory Access) - running SRP over your Infiniband infrastructure, together with your Interconnect.
This is btw what Oracle's Database Machine and Exadata Storage servers use (and one the reasons they have broken all RAC performance records).

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Network adapter for the private interface for RAC

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