Sun Fire V445 Server Administration Guide - SCN Research

CHAPTER 6
Managing Disk Volumes
This chapter describes redundant array of independent disks (RAID) concepts, how
to manage disk volumes, and how to configure hardware mirroring using the SAS
controller.
This chapter contains the following sections:
■ “About Disk Volumes” on page 111
■ “About Volume Management Software” on page 112
■ “About RAID Technology” on page 114
■ “About Hardware Disk Mirroring” on page 116
■ “About Physical Disk Slot Numbers, Physical Device Names, and Logical Device
Names” on page 117
■ “Creating a Hardware Disk Mirror” on page 118
■ “Deleting a Hardware Disk Mirror” on page 120
■ “Performing a Mirrored Disk Hot-Plug Operation” on page 121
■ “Performing a Nonmirrored Disk Hot-Plug Operation” on page 123
About Disk Volumes
Disk volumes are logical disk devices comprising one or more physical disks or
partitions from several different disks.
Once you create a volume, the OS uses and maintains the volume as if it were a
single disk. By providing this logical volume management layer, the software
overcomes the restrictions imposed by physical disk devices.
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