Red Hat GNBD WITH GLOBAL FILE SYSTEM IN RHEL 4.5 Guía de instalación descargar pdf (Pagina 10)

Chapter 1. Device Mapper Multipathing

Figure 1.1. Active/Passive Multipath Configuration with One RAID Device

In this configuration, there is one I/O path that goes through hba1, SAN1, and controller 1 and a

second I/O path that goes through hba2, SAN2, and controller2. There are many points of possible

failure in this configuration:

• HBA failure

• FC cable failure

• SAN switch failure

• Array controller port failure

With DM-Multipath configured, a failure at any of these points will cause DM-Multipath to switch to the

alternate I/O path.

Figure 1.2, “Active/Passive Multipath Configuration with Two RAID Devices” shows a more complex

active/passive configuration with 2 HBAs on the server, 2 SAN switches, and 2 RAID devices with 2

RAID controllers each.

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Red Hat GNBD WITH GLOBAL FILE SYSTEM IN RHEL 4.5 Guía de instalación Pagina 10