Deployment Guide

37 ScaleIO/VxFlex OS IP Fabric Best Practice and Deployment Guide with OS10EE | version 1.0
4 Scaling and tuning guidance
4.1 Decisions on scaling
Dell EMC Networking provides a resilient, high-performance architecture that improves availability and meets
Service Level Agreements (SLAs) more effectively. This example uses the Dell EMC Networking S4248FB-
ON switch because of its ability to provide a low latency with deep buffers for optimum performance. The forty
10GbE, two 40GbE, and six 100GbE ports in a single rack unit provide flexibility in the data center for
1/10/40/100GbE uplink compatibility.
The S4248FB-ON switches connect to Z9100-ON switches as the spine of the networking topology. The
Z9100-ON switch adds multiline rate capability supporting 10GbE, 25GbE, 40GbE, 50GbE and 100GbE. It
provides for substantial growth with this initial configuration using 40GbE links but able to move to 25GbE
downlinks and 100GbE uplinks.
4.2 Examples of scaling, port count, and oversubscription
An example of scaling this solution is a rack pod configuration of 16 racks. This pod consists of one rack that
contains WAN-edge connectivity and one rack for management servers. There are 14 racks of the SDS
storage/compute nodes each holding 19 PowerEdge R730xd’s.
In this example, each R730xd has four 10Gb uplinks with 19 servers/nodes per rack. Additionally, the
example architecture has four spine switches.
Connections for 16 racks with four spine switches
PowerEdge
R730xd
Server
connections to
leaf switches
Leaf connections to spine
switches per rack
Total connections for
leaf switches to four
spine switches
Connections
4 NIC ports
19 X 4 = 76
4 per leaf switch, 2 leaf
switches per rack = 8 links
16 racks * 8 = 128
Speed of ports
10Gb
10Gb
40Gb/ 100Gb
40Gb/ 100Gb
Total theoretical
available bandwidth
4 x 10 =
40Gb
76 X 10 =
760Gb
8 * 40 per rack = 320Gb
8 * 100Gb per rack = 800Gb
16 * 320Gbs = 5120 Gb
16 * 800 = 12,800Gb
This example provides for an oversubscription rate of 2.375:1 for 40Gb or 1:1 oversubscription for 100Gb
connectivity.