Sun Microsystems SPARC Enterprise T1000, Administration Manual

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40 Sun SPARC Enterprise T1000 Server Administration Guide • April 2007
The on-board disk controller of the server provides for the creation of one hardware
RAID volume. The controller supports either a two-disk RAID 1 (integrated mirror,
or IM) volume or a two-disk RAID 0 (integrated stripe, or IS) volume.
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
the
format
(1M) man page for further details.
Volume migration (relocating all RAID volume disk members from one server
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, 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)
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 two-disk IS volume configured on
72 GByte drives will have a 144 GByte capacity.