D-Link xStack Storage DSN-5210, Hardware Reference Manual

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4 Chapter 1 Introduction
1.3 System Overview
Figure 1-1 shows a typical DSN-5000 series storage system (primary array DSN-5210 or 5410)
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.
Figure 1-1. Example of a DSN-5000 series Storage System Configuration
When equipped with dual controllers, the DSN-5210 or 5410 system 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 the DSN-5210 or DSN-5410 systems.
A Field Upgrade Kit is available to add a redundant controller (DSN-520 for the 5210 or DSN-540
for the 5410) to any existing single-controller system (DSN-5210 or DSN-5410). Similarly, a
Field Upgrade Kit is available to add a second I/O Module to the DSN-5000 expansion array (The
expansion array with a single I/O module is the DSN-5000. An additional I/O module for the
DSN-5000 is the DSN-500), which is required when the DSN-5210 or DSN-5410 system is
equipped with dual controllers.
To clarify: A DSN-5210 or DSN-5410 system each has a single controller. For additional storage
array expansion, each would require a DSN-5000 expansion array which itself has a single I/O
module. A single external SAS to mini-SAS cable (provided with the DSN-5000) will then
connect the controller in the DSN-5210 or DSN-5410 to the I/O module in the DSN-5000.
A DSN-5210 with dual controllers (an additional controller DSN-520 is inserted in the second bay)
or a DSN-5410 with dual controllers (an additional controller DSN-540 is inserted in the second
bay) will require a DSN-5000 expansion array with two I/O modules (an additional I/O module
DSN-500 is inserted in the second bay of the DSN-5000). An additional SAS to mini-SAS cable
(provided with the DSN-500) will connect the second controller in the DSN-5210 or DSN-5410 to
the second I/O module (DSN-500) installed in the DSN-5000 expansion array. You will now have
dual redundancy between the DSN-5210 or DSN-5410 and the DSN-5000 expansion array.