Dell SC8000, Deployment Manual

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Chapter 4 Connect the Front End
112 Storage Center SC8000 Controller Deployment Guide
Figure 96. Dual-controller with Single-Network iSCSI in Legacy Mode
Legacy Mode with Dual-Network iSCSI
Use two networks with legacy mode to prevent a switch failure or controller failure from
causing an outage.
In this configuration, four fault domains are spread across both controllers. Each fault
domain contains sets of primary and reserve paths (P1 ‐ R1, P2 ‐ R2, P3 ‐ R3, and P4 ‐ R4). To
provide redundancy, the primary port and the corresponding reserve port in a fault
domain must connect to the same network. When MPIO is configured on the iSCSI servers,
the primary paths provide redundancy for a single port or cable failure. The reserved paths
provide redundancy for single controller failure.
Prerequisites
Each controller must have two available iSCSI front ‐ end ports for each Ethernet switch.
Steps
1 Connect each iSCSI server to both Ethernet switches.
2 Connect fault domain 1 (shown in orange) to switch 1.

Primary port P1 : Controller A, slot 3, port 1
→
Switch 1

Reserved port R1 : Controller B, slot 3, port 1
→
Switch 1
Ethernet Switch 1
iSCSI Network 1
Server
Controller B
Controller A
P1 P2 R1 R2
4
3
2 1
4
3
2 1
1 2
1 2
2 1
2 1