System Overview - D-Link DSN-5210-10 - xStack Storage Area Network Array Hard Drive Hardware Reference Manual

1.3

System Overview

Figure 1-1 shows a typical DSN-5000 series storage system (primary array DSN-5110-10, DSN-5210-10
or DSN-5410-10) configuration in a Storage Area Network (SAN). The SAN shown is an Ethernet
network used solely for exchanging data between the customer's host servers and the DSN-5000
series storage system. The Ethernet bandwidth used by the servers exchanging data with the DSN-
5000 series storage system can be very high. Using a separate Ethernet network to act as a SAN
keeps that data from interfering with the customer's existing LAN and improves security.
When equipped with dual controllers, the DSN-5000 series primary array provides High
Availability (HA) with automatic failover to the redundant controller. When a failure occurs on
the primary controller, the Management Port and all of the iSCSI data ports will be automatically
redirected to the equivalent ports on the redundant controller, without any interruption to your
host server applications. To accomplish the redirection of network traffic on those ports, a
network switch must be used between the host server(s) and both of the controllers found in the
DSN-5000 series primary array prior to system startup to allow the automatic re-direction of the
network connections to the redundant controller when a failure occurs on the primary controller.
For example, the Management Port network connection on both controllers must be connected to
the same network switch. Similarly, Data Port 0 on both controllers must also be connected to
the same network switch, and so on.
A Field Upgrade Kit is available to add a redundant controller (DSN-510 for the 5110-10, DSN-520
for the 5210-10 or DSN-540 for the 5410-10) to any existing single-controller system. Similarly, a
Field Upgrade Kit is available to add a second I/O Module to the DSN-5000-10 expansion array
(The expansion array with a single I/O module is the DSN-5000-10. An additional I/O module for
the DSN-5000-10 is the DSN-500), which is required when the DSN-5110-10, 5210-10 or 5410-10
system is equipped with dual controllers.
To clarify: DSN-5110-10, DSN-5210-10 or DSN-5410-10 systems all have a single controller. For
additional storage array expansion, each would require a DSN-5000-10 expansion array which
itself has a single I/O module. A single external SAS to mini-SAS cable (provided with the DSN-
5000-10) will then connect the controller in the DSN-5110-10, DSN-5210-10 or DSN-5410-10 to the
I/O module in the DSN-5000-10.
6 Chapter 1 Introduction
Figure 1-1. Example of a DSN-5000 series Storage System Configuration