Device Configuration Jumpers; Figure 12. Device Configuration Jumpers - Silicon Graphics DSS-1 Hardware Description

Product Overview DSS-1 and DSS-2 Hardware Description
Device Configuration Jumpers
1
2
3
4
5
6
7
20
Two headers on the rear panel of each disk drive inside the drive canister (labeled
JOI and J4 in Figure 7) hold jumpers that establish drive operational parameters.
Figure 12 shows the position of all jumpers that are installed in JO I and J4. The
jumper at position 2 (delay motor start) of J4 is in parallel with a similar
connection on the backplane, and is therefore redundant. The jumper at position
3 (enable motor start) of J4 depends on customer requirements and is installed
by system checkout engineers before hardware shipment to the site.
Figure 12. Device Configuration Jumpers
Internal Disk
Drive
J4
J01
-
Write Protect
DO
...
1 [t]2
-
...
Delay Motor Start
3
04
-
...
Enable Motor Start
DO
...
Parity Disable
DO
...
(Reserved)
NOTE: This jumper
configuration enables
DO
...
(Not Used)
termination power to
DO
...
(Reserved)
the SCSI bus.
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Silicon Graphics Proprietary
HMM-199-A