Red Hat LINUX VIRTUAL SERVER 4.7 - ADMINISTRATION Installationsanleitung PDF herunterladen (Seite 12)

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 T wo 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.

Figure 1.2. Act ive/Passive Multipath Configurat ion with Two RAID Devices

As in the example shown in Figure 1.1, “Active/Passive Multipath Configuration with One RAID Device”,

there are two I/O paths to each 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.

Chapter 1. Device Mapper Multipathing

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Red Hat LINUX VIRTUAL SERVER 4.7 - ADMINISTRATION Installationsanleitung Seite 12