nStor NexStor 4700S Series, Руководство пользователя

Страница: 24 / 110

Chapter 1 - Getting Started
Automatic Termination Override
12
There are four switches numbered 1 - 4, and they control termination and term
power on each of the controller’s host channel I/O connectors. Switches 1 and 2
are for the upper and lower host Channel 1 connectors and switches 3 and 4 are
for the upper and lower host Channel 0 connectors, respectively. The switches
should be set in pairs, that is for example if switch 1 is set to the “Up” position,
then switch 2 should as well be set to the “Up” position.
In a Expansion Connection configuration (daisy-chain), enclosures are cabled to
each other up to a maximum of three (3) enclosures. Since the RAID Controller is
not supplying the term power, a manual override is provided through the
switches. This is due to a logical condition where termination is disabled when a
cable is sensed plugged into the connector. The controller relies on the host HBA
to supply the term power. When connecting this configuration you will be
instructed to set the switch settings to the Up positio on the enclosure’s RAID
Controller for those enclosures between the host and the last enclosure in the
daisy-chain. The switches on the last enclosure should be set to the down
position. Their default position is the down position.
Daisy-Chain Enclosure Termination Switch Settings
1 2 3 4
ON
1 2 3 4
ON
1 2 3 4
ON
RS-232
DTE
H OST CH 1 H OST CH 0
H OST CH 1 H OST CH 0 DR
T H1A
BK1A
PWR H0A BK0A
RS-232
DTE
H OST CH 1 H OST CH 0
H OST CH 1 H OST CH 0 DR
T H1A
BK1A
PWR H0A BK0A
RS-232
DTE
H OST CH 1 H OST CH 0
H
OST
CH
1
H
OST
CH
0
DR
T H1A
BK1A
PWR H0A BK0A
SCSI Data Cable
SCSI Data Cable
SCSI Data Cable
SCSI Data Cable
SCSI Data Cable
SCSI Data Cable
Host Server
Host Server
NexStor 4711S (Channel IDs 8 & 9 )
Set Switches 1 - 4
to the up position
NexStor 4711S (Channel IDs 4 & 5)
NexStor 4711S (Channel IDs 2 & 3)
HBA (Initiator ID 7)
HBA (Initiator ID 7)
Set Switches 1 - 4
to the up position
Set Switches 1 - 4
to down position
Upper Channel 1
Lower Channel 1
Upper Channel 0
Lower Channel 0
4700S.book Page 12 Wednesday, April 6, 2005 2:14 PM