Autotermination Indication Leds; Table 5-3 Autotermination Indication Leds - Sun Microsystems StorEdge S1 Array Installation And Maintenance Manual

Autotermination Indication LEDs

The Autotermination Indication LEDs indicate if the array is part of an UltraSCSI,
wide SCSI, or narrow SCSI daisy chain. They also indicate the array's position in the
daisy chain.
Autotermination Indication LEDs
TABLE 5-3
HIGH LOW Meaning
Off Off The array is the first device in the UltraSCSI or wide SCSI daisy chain;
another device follows the Sun StorEdge S1 array.
On On The array is the last or only device in the UltraSCSI or wide SCSI daisy
chain.
On Off A narrow SCSI device follows the array in the daisy chain.
Off On N/A
Note – UltraSCSI devices (such as the Sun StorEdge S1 array) at the end of a daisy
chain do not require a terminator, but some wide SCSI devices at the end of a daisy
chain do require a terminator. Refer to the documentation that came with your wide
SCSI device to determine if it needs a terminator. Narrow SCSI devices at the end of
a daisy chain always require a terminator.
shows two arrays connected in a daisy chain to a host system. Both HIGH
FIGURE 5-5
and LOW autotermination LEDs are Off on the top array, which indicates that the
array is the first device on the daisy chain and that another device follows it. On the
next array, both HIGH and LOW autotermination LEDs are On, which indicates that
the array is the last array in the daisy chain.
Chapter 5 Maintenance Tasks 89