Chapter 3. IBM System Storage DS4000 and DS5000 hardware 71
Controller
The controllers contain the storage subsystem control logic, interface ports, and LEDs.
Depending on the DS5020 configuration you purchased, your controllers are one of the
following types:
Controllers with 1 GB memory and two standard 8 Gbps FC host ports
Controllers with 1 GB memory, two standard 8 Gbps FC host ports, and one optional
2-port 8 Gbps FC host card
Controllers with 1 GB memory, two standard 8 Gbps FC host ports, and one optional
2-port 1 GB iSCSI host card
Controllers with 2 GB memory and two standard 8 Gbps FC host ports
Controllers with 2 GB memory, two standard 8 Gbps FC host ports, and one optional
2-port 8 Gbps FC host card
Controllers with 2 GB memory, two standard 8 Gbps FC host ports, and one optional
2-port 1 GB iSCSI host card
The controllers vary only in the size of the cache (either 1 or 2 GB) and the type of the
optional Host Interface Card (either none, FC, or iSCSI).
Figure 3-46, Figure 3-47 on page 72, and Figure 3-48 on page 72 show the different DS5020
controller host interface configurations that are available. Figure 3-46 shows the base
DS5020 storage subsystem, with two Fibre Channel host ports only. A field upgrade is not
possible.
Figure 3-46 DS5020 controller with standard dual 8 Gbps FC host ports: Base model
Ctrl B
Ctrl A
FC Host Channels (Ch)
Ch 1
Ch 1
Ch 2
Ch 2
2
8
4
2
8
4
4
2
FC Drive Channels (Ch)
P 1
Ch 2
Ch 1
P 2
Port 1
Port 2
ID Diag
Onboard
dual port
8 Gbps HIC
Onboard
4 Gbps drive
channel (one)
ports
Out-of-Band
Management
Ethernet ports
Serial port to
access console
shell (service
personnel only)
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