FUJITSU T5140 - Manual (Page 72)

50 SPARC Enterprise T5140 and T5240 Servers Administration Guide • February 2008
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 on-board disk controller of the SPARC Enterprise T5140 or T5240 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 up to eight-
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 59
, or the format(1M) man page for further details.
Volume migration (relocating all RAID volume disk members from one SPARC
Enterprise T5140 or T5240 chassis to another) is not supported. If you must perform
this operation, contact your service provider.
RAID Technology
RAID technology enables 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 T5140 or T5240 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)
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.