diff --git a/docs.it4i/anselm/network.md b/docs.it4i/anselm/network.md index 79c6f1a37f0d22f286e4de57dac097dcea8d19e8..f7890c08ed6582f3077b0aba8af84dbac73a30af 100644 --- a/docs.it4i/anselm/network.md +++ b/docs.it4i/anselm/network.md @@ -1,15 +1,15 @@ # Network -All compute and login nodes of Anselm are interconnected by [InfiniBand](http://en.wikipedia.org/wiki/InfiniBand) QDR network and by Gigabit [Ethernet](http://en.wikipedia.org/wiki/Ethernet) network. Both networks may be used to transfer user data. +All of the compute and login nodes of Anselm are interconnected through an [InfiniBand](http://en.wikipedia.org/wiki/InfiniBand) QDR network and a Gigabit [Ethernet](http://en.wikipedia.org/wiki/Ethernet) network. Both networks may be used to transfer user data. ## InfiniBand Network -All compute and login nodes of Anselm are interconnected by a high-bandwidth, low-latency [InfiniBand](http://en.wikipedia.org/wiki/InfiniBand) QDR network (IB 4 x QDR, 40 Gbps). The network topology is a fully non-blocking fat-tree. +All of the compute and login nodes of Anselm are interconnected through a high-bandwidth, low-latency [InfiniBand](http://en.wikipedia.org/wiki/InfiniBand) QDR network (IB 4 x QDR, 40 Gbps). The network topology is a fully non-blocking fat-tree. The compute nodes may be accessed via the InfiniBand network using ib0 network interface, in address range 10.2.1.1-209. The MPI may be used to establish native InfiniBand connection among the nodes. !!! note - The network provides **2170 MB/s** transfer rates via the TCP connection (single stream) and up to **3600 MB/s** via native InfiniBand protocol. + The network provides **2170 MB/s** transfer rates via the TCP connection (single stream) and up to **3600 MB/s** via the native InfiniBand protocol. The Fat tree topology ensures that peak transfer rates are achieved between any two nodes, independent of network traffic exchanged among other nodes concurrently. @@ -32,4 +32,4 @@ $ ssh 10.2.1.110 $ ssh 10.1.1.108 ``` -In this example, we access the node cn110 by InfiniBand network via the ib0 interface, then from cn110 to cn108 by Ethernet network. +In this example, we access the node cn110 through the InfiniBand network via the ib0 interface, then from cn110 to cn108 through the Ethernet network.