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Chapter 5
System Administration Software
71
connections. This multipathing capability also provides greater I/O throughput by
automatically balancing the I/O load uniformly across multiple I/O paths to each
disk device.
Multiplexed I/O (MPxIO)
A newer alternative to DMP that is also supported by the Sun Fire V480 server is
multiplexed I/O (MPxIO). Beginning with Solaris 8, MPxIO is fully integrated
within the Solaris operating environment’s core I/O framework. MPxIO enables you
more effectively to represent and manage devices that are accessible through
multiple I/O controller interfaces within a single instance of the Solaris operating
environment.
The MPxIO architecture:
■
Helps protect against I/O outages due to I/O controller failures. Should one I/O
controller fail, MPxIO automatically switches to an alternate controller.
■
Increases I/O performance by load balancing across multiple I/O channels.
Both Sun StorEdge T3 and Sun StorEdge A5x00 storage arrays are supported by
MPxIO on a Sun Fire V480 server. Supported I/O controllers are
usoc/fp
FC-AL
disk controllers and
qlc/fp
FC-AL disk controllers.
RAID Concepts
VERITAS Volume Manager and Solstice DiskSuite software support RAID
technology to optimize performance, availability, and user cost. RAID technology
improves performance, reduces recovery time in the event of file system errors, and
increases data availability even in the event of a disk failure. There are several levels
of RAID configurations that provide varying degrees of data availability with
corresponding trade-offs in performance and cost.
This section describes some of the most popular and useful of those configurations,
including:
■
Disk concatenation
■
Disk mirroring (RAID 1)
■
Disk striping (RAID 0)
■
Disk striping with parity (RAID 5)
■
Hot spares
Summary of Contents for Sun Fire V480
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