communicating via a network connection to each managed
device.
The Cambex Dynamic Path Failover driver is a Path
Management component that allows multiple paths to a storage
device and provides automatic failover between available paths.
Cambex Dynamic Path Failover software provides both a
command line interface and access through smit, the standard
integrated management tool for AIX.
SCSI and FCP Drivers
AIX makes two types of device drivers available. SCSI device
drivers support SCSI-2 disk and tape devices. FCP device
drivers support newer SCSI-3 disk and tape devices, which
provides a larger address space for target ID and LUN. When
using the FCP device driver, the adapter will be configured with
a name like
fscsi2
.
Load Balancing
Selection of which path to use happens in one of three ways.
Static load balancing allows the operator to select which path is
used to access a LUN. This is the default method. Preferred
Paths allow certain RAID arrays to automatically specify a path
choice. See the next section on Preferred Paths for more
information. Finally, turning on Load Balancing will send I/O
on all available paths using round robin scheduling.
5
