SNC 4000 User’s Guide
51
2
If the SNC’s command prompt on the terminal is not
diagmode >
place the SNC in diagnostic mode.
For more information, see
Entering Diagnostic Mode
on page 135.
3
Shut down the SNC.
4
Remove the cable from one attached SCSI device, and attach it as a loop back cable to the SNC.
5
Power on the SNC.
6
After the SNC has finished booting, enter the
scsiChannelTest(x,y)
command from the service
terminal (where ‘
x
’ and ‘
y
’ are the slot numbers connected by the loopback cable) to perform a loop
back test.
For an example, see
SCSI Loop Back Test
on page 50.
If the SNC returns a FAILED status, the cable is faulty and must be replaced.
If the SNC returns a PASSED status, go to
Isolating SCSI Devices
on page 51 to isolate bad devices
on the SCSI bus.
Isolating SCSI Devices
1
Restore the SNC to normal operation.
See
Restoring Normal Mode
on page 136.
2
Power down the Scalar 24.
3
Perform
Step 4
-
Step 11
for each SCSI device that was found missing in
Step 1
under
Compare Listed
versus Physical Devices
on page 47.
4
Remove all devices from the SCSI buses.
5
Attach ONLY the device in question to the SCSI channel it was originally connected to using a known-
good SCSI cable and terminators.
6
Power the SNC back on. Wait for it to finish booting.
7
Enter the
scsiShow
command from the service terminal and verify the device’s presence.
For more information, see the
scsiShow
on page 106.
8
If the device is missing from the display, it needs to be replaced and/or serviced.
Inform the system administrator of any suspected bad devices found in this step.
Replace or remove any bad devices.
9
If the device is present, perform a health check.
For more information, see
Perform Health Check
on page 44.
10
Review the host event log.
For more information, see
Check the Host Event Log
on page 45.
11
If SCSI errors are found, then inform the system administrator that the connected device appears to be
bad.
Replace or remove any bad devices.
12
After all possible device checks are performed go to
Restore SCSI Setup
.
Restore SCSI Setup
1
Shut down the SNC.
2
Reconnect all available SCSI devices to their proper channel assignments.
Содержание SNC 4000
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Страница 10: ...4 SNC 4000 Introduction...
Страница 40: ...34 Removal and Replacement Procedures...
Страница 140: ...134 Service Port Command Reference...
Страница 147: ...SNC 4000 User s Guide 141 fcConnPortModeGet...
Страница 148: ...142 Diagnostic Command Reference...
