Adaptec ASC39320A-ROHS-KIT Betriebsanweisung Seite 26

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Adaptec Ultra320 SCSI Cards Users Guide
Termination on SE internal SCSI devices is usually controlled by
manually setting a jumper or a switch on the device, or by
physically removing or installing one or more resistor modules
on the device.
Termination on most external SCSI devices is controlled by
installing or removing a SCSI terminator. However, termination
on some external SCSI devices is enabled or disabled by setting
a switch on the back of the SCSI device.
By default, termination on an Adaptec SCSI Card itself is set to
Automatic (the preferred method). We recommend that you do
not change this default setting. This automatic setting is just for
the Adaptec SCSI Card itself; the card cannot change the
termination setting on a device.
Internal and External Ultra320/Ultra160 and Ultra2 SCSI LVD
SCSI buses must be terminated with an LVD terminator. This is
sometimes referred to as an LVD terminator or a Multimode
terminator.
Defining RAID
RAID (Redundant Array of Independent Disks) offers data
protection, outstanding data availability, excellent performance,
and high capacity. A RAID is defined as:
Unified arrayTwo or more hard drives are grouped to appear
as one single device to the host system while operating
independently of one another.
Fault-tolerant redundancyIf one drive fails no data is lost.
(RAID 0 is an exception to this definition because RAID 0 is not
fault tolerant. See Supported RAID Levels.)
U320 UG.book Page 10 Tuesday, September 23, 2003 1:47 PM
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