Cards (NICs) Ethernet in the RAC configuration

DB version: 11g


I came across this nice link on the RAC configuration
http://www.akadia.com/services/ora_rac.html

Question 1.

Cons. in the diagram, I can see eth0 and eth1 in both nodes. They are physical maps ethernet (NIC). Right?


Question 2.
Each node has 2 ethernet cards is common in the industry. Right?



Question 3.
For Private InterConnect ===>One ethernet card from each node, connected via Switch1

For Public InterConnect plus Connection to Shared storage  ====> One ethernet card from each node, connected via Switch2
This is the standard practice in Production DBs?

A question that you asked and there are very important with regard to the questions you have asked - what is the best technology to use for interconnection (private network and switch)?

And is not ethernet (as shown in this diagram you mentioned). The speed and scalability of the interconnection have a major impact on the performance of the cluster.

Gig-ethernet is limited in scalability and features. 10 Gb/s is the maximum. The standard of 1 Gbps. It does not support SDP (Sockets Direct Protocol), SRP (SCSI RDMA/Remote direct memory access Protocol) and so on. (although SRP specifications were available to sellers for implementing ethernet).

If you look at what Oracle Database Machine and Exadata storage servers is using, this is Infiniband... and protocols such as SRP.

InfiniBand out-of-the-box works at 40 Gbit/s (extendable up to 120 GB/s). Port to port latency is as low as 60ns (and still less with hardware and new technologies of the IB).

I don't see how GigE even thinking to challenge Infiniband with in this regard. Especially since Oracle himself chose as the interconnection architecture (and layer of communication of storage) for the fastest CARS ever built systems.

And no, it's not expensive either. Our IB material cost us really less similar material GigE.

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