Red Hat GNBD WITH GLOBAL FILE SYSTEM IN RHEL 4.5 Przewodnik Instalacji Pobierz pdf (Strona 11)

Overview of DM-Multipath

Figure 1.2. Active/Passive Multipath Configuration with Two RAID Devices

In the example shown in Figure 1.2, “Active/Passive Multipath Configuration with Two RAID Devices”,

there are two I/O paths to each RAID device (just as there are in the example shown in Figure 1.1,

“Active/Passive Multipath Configuration with One RAID Device”). With DM-Multipath configured, a

failure at any of the points of the I/O path to either of the RAID devices will cause DM-Multipath to

switch to the alternate I/O path for that device.

Figure 1.3, “Active/Active Multipath Configuration with One RAID Device” shows an active/active

configuration with 2 HBAs on the server, 1 SAN switch, and 2 RAID controllers. There are four I/O

paths from the server to a storage device:

• hba1 to controller1

• hba1 to controller2

• hba2 to controller1

• hba2 to controller2

In this configuration, I/O can be spread among those four paths.

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Red Hat GNBD WITH GLOBAL FILE SYSTEM IN RHEL 4.5 Przewodnik Instalacji Strona 11