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This striping is handled by the volume-management software and is completely
transparent to Oracle. Figure 7-1 illustrates host-based volume management.
Figure 7-1. Host-based volume management
Oracle Instance
Operating System
Volume Manager
Database Server
Volume 1
RAID-5 Array
Volume 2
RAID-5 Array
Volume 3
RAID-1 Array
Oracle and Disk I/O Resources | 165
Oracle began providing its own volume manager software for Linux and Windows in
Oracle9i Release 2. Since Oracle Database 10g, database releases for all supported
operating systems include a cluster file system and volume manager in the database
that is leveraged by ASM. When using ASM, it is recommended that you not try to
leverage an operating system volume manager.
Dedicated storage subsystems
Dedicated storage systems, often referred to as disk farms, contain disks, controllers,
CPUs, and (usually) memory used as an I/O cache. Vendors include EMC, Network
Appliance, Hewlett-Packard, IBM, and Sun. These subsystems offload the task of
managing the disk arrays from the database server.


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