64 Netra T2000 Server Administration Guide • September 2006
Disk Volumes
From the perspective of the server’s on-board disk controller, disk volumes are logical
disk devices comprising one or more complete physical disks.
Once you create a volume, the operating system uses and maintains the volume as if
it were a single disk. By providing this logical volume management layer, the
operating system overcomes the restrictions imposed by physical disk devices.
The on-board disk controller of the server provides for the creation of as many as
two hardware RAID volumes. The controller supports either two-disk RAID 1
(integrated mirror, or IM) volumes, or two-, three- or four-disk RAID 0 (integrated
stripe, or IS) volumes.
Note – Due to the volume initialization that occurs on the disk controller when a
new volume is created, properties of the volume such as geometry and size are
unknown. RAID volumes created using the hardware controller must be configured
and labeled using format(1M) prior to use with the Solaris Operating System. See
“To Configure and Label a RAID Volume” on page 73, or the format (1M) man page
for further details.
Volume migration (relocating all RAID volume disk members from one chassis to
another) is not supported. If this operation must be performed, contact Sun Service.
RAID Technology
RAID technology allows for the construction of a logical volume, made up of several
physical disks, to provide data redundancy, increased performance, or both. The
server’s on-board disk controller supports both RAID 0 and RAID 1 volumes.
This section describes the RAID configurations supported by the on-board disk
controller:
■ Integrated stripe, or IS volumes (RAID 0)
■ Integrated mirror, or IM volumes (RAID 1)
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