50
Maintenance Action Plans
For more information, see the
scsiShow
on page 106.
6
Compare the list of attached devices with the physical devices.
7
If not all of the physical devices are shown, go to
SCSI Loop Back Test
.
8
If all of the physical devices are shown, go to
SCSI Health Check
.
SCSI Health Check
1
Perform a Health Check. For more information, see
Perform Health Check
on page 44.
2
Check the Event Log for SCSI errors. For more information, see
Check the Host Event Log
on page 45.
3
Perform a component check. For more information, see
Quick Component Check
on page 44.
4
If errors are still indicated, go to
SCSI Loop Back Test
on page 50.
If no errors are reported, exit this MAP.
SCSI Loop Back Test
1
If the SNC’s command prompt on the terminal is not
diagmode >
, enter the
diagBoot
command on
the service terminal.
For more information, see
Entering Diagnostic Mode
on page 135.
2
Power down the Scalar 24.
3
In addition to the suspect SCSI channel, choose one of the other SCSI channels to use for the loop back
test.
4
Label and remove those cables.
5
Connect a short SCSI loopback test cable to those two SCSI channels.
6
Power on the system.
7
Wait for the SNC to finish booting.
8
Enter the
scsiChannelTest(1,2)
command. The following example shows a loop back test on SCSI
channels 1 and 2.
diagmode > scsiChannelTest (1,2)
SCSI-1 -> SCSI-2 [##########] 10 iterations PASSED
SCSI-2 -> SCSI-1 [##########] 10 iterations PASSED
value = 0 = 0x0
9
If the SNC returns a PASSED status, go to
Testing SCSI Cables
on page 50.
Testing SCSI Cables
If the cables of the devices attached to a channel have a compatible pinout on both sides, the SNC can test
the cable using the loop back test.
1
Stop all I/O to the SNC.
CAUTION
Before performing diagnostics, all FC and SCSI cables must be
disconnected from the SNC. Before changing any SCSI cables, all I/O
to the SNC must be stopped and the SNC must be turned off. Do not
perform SCSI loop back tests on SCSI channels that are attached to
SCSI target devices. If you do this, you will corrupt the data on the
device.
Summary of Contents for SNC 4000
Page 1: ...www adic com ADICSNC 4000User sGuide ADVANCED DIGITAL INFORMATION CORPORATION...
Page 10: ...4 SNC 4000 Introduction...
Page 40: ...34 Removal and Replacement Procedures...
Page 140: ...134 Service Port Command Reference...
Page 147: ...SNC 4000 User s Guide 141 fcConnPortModeGet...
Page 148: ...142 Diagnostic Command Reference...
