Dell SC4020 Deployment Manual page 64

5. Storage controller 1
Next steps
Install or enable MPIO on the host servers.
NOTE: For the latest best practices, see the Dell Storage Center Best Practices document located
on the Dell TechCenter (http://en.community.dell.com/techcenter/storage/).
Legacy Mode — One Fibre Channel Fabric with Dual 8 Gb 4–Port Storage Controllers
Use one Fibre Channel (FC) fabric with legacy mode to prevent an unavailable storage controller from
causing a loss of connectivity between host servers and a storage system with dual 8 Gb 4-port storage
controllers.
About this task
In this configuration, there are two fault domains, one FC fabric, and one FC switch.
• Each fault domain contains a set of primary and reserve paths (P1-R1, P2-R2, P3-R3, and P4-R4).
• To provide redundancy, the primary port and corresponding reserve port in a fault domain must
connect to the same fabric.
• When MPIO is configured on the servers, the primary paths provide redundancy for an unavailable
server or storage controller port. The reserved paths provide redundancy for an unavailable storage
controller.
NOTE: This configuration is vulnerable to switch unavailability, which results in a loss of connectivity
between the host servers and storage system.
Steps
1. Connect each server to the FC fabric.
2. Connect fault domain 1 (shown in orange) to the fabric.
• Primary port P1 — Storage controller 1: port 1 to the FC switch
• Reserved port R1 — Storage controller 2: port 1 to the FC switch
3. Connect fault domain 2 (shown in blue) to the fabric.
• Primary port P2 — Storage controller 2: port 2 to the FC switch
• Reserved port R2 — Storage controller 1: port 2 to the FC switch
4. Connect fault domain 3 (shown in gray) to the fabric.
• Primary port P3 — Storage controller 1: port 3 to FC switch
• Reserved port R3 — Storage controller 2: port 3 to FC switch
5. Connect fault domain 4 (shown in red) to the fabric.
• Primary port P4 — Storage controller 2: port 4 to FC switch
• Reserved port R4 — Storage controller 1: port 4 to FC switch
64
6. Storage controller 2
Connect the Front-End Cabling