Raid Technology; Integrated Stripe Volumes (Raid - Fujitsu SPARC Enterprise T2000 Administration Manual

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
software overcomes the restrictions imposed by physical disk devices.
The onboard disk controller of the SPARC Enterprise T2000 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 Hardware RAID Volume for Use in the Solaris Operating
System" on page
Volume migration (relocating all RAID volume disk members from one SPARC
Enterprise T2000 chassis to another) is not supported. If this operation must be
performed, please contact your service provider.

RAID Technology

RAID technology allows for the construction of a logical volume, made up of several
physical disks, in order to provide data redundancy, increased performance, or both.
The SPARC Enterprise T2000 server's on-board disk controller supports both RAID 0
and RAID 1 volumes.
This section describes the RAID configurations supported by the onboard disk
controller:
Integrated stripe, or IS volumes (RAID 0)
■
Integrated mirror, or IM volumes (RAID 1)
■

Integrated Stripe Volumes (RAID 0)

Integrated Stripe volumes are configured by initializing the volume across two or
more physical disks, and sharing the data written to the volume across each physical
disk in turn, or striping the data across the disks.
Integrated Stripe volumes provide for a logical unit (LUN) that is equal in capacity
to the sum of all its member disks. For example, a three-disk IS volume configured
on 72 GB drives will have a 216 GB capacity.
46 SPARC Enterprise T2000 Server Administration Guide • April 2007
55, or the format(1M) man page for further details.