HP StorageWorks Fabric OS 5.X Administrator Guide (AA-RVHWB-TE, September 2005)
160 Troubleshooting
To troubleshoot a marginal link:
1. Issue the portErrShow command.
For example:
2. Establish whether there is a relatively high number of errors (such as CRC errors or ENC_OUT errors),
or if there is a steadily increasing number of errors to confirm a marginal link.
3. If you suspect a marginal link, isolate the areas by moving the suspected marginal port cable to a
different port on the switch.
If the problem stops or goes away, the switch port or the SFP is marginal (proceed to step 4)
If the problem does not stop or go away, proceed to step 7.
4. Replace the SFP on the marginal port.
5. Verify that you have an adapter to run the loopback test for the SFP. If you do not have an adapter,
run the portLoopBack test on the marginal port using the loopback mode lb=5. See the HP
StorageWorks Fabric OS 5.x command reference guide for additional information. Table 29 describes
the loopback modes.
switch:admin> porterrshow
frames enc crc too too bad enc disc link loss loss frjt fbsy
tx rx in err shrt long eof out c3 fail sync sig
sig=====================================================================
0: 22 24 0 0 0 0 0 1.5m 0 7 3 0 0 0
1: 22 24 0 0 0 0 0 1.2m 0 7 3 0 0 0
2: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
3: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
4: 149m 99m 0 0 0 0 0 448 0 7 6 0 0 0
5: 149m 99m 0 0 0 0 0 395 0 7 6 0 0 0
6: 147m 99m 0 0 0 0 0 706 0 7 6 0 0 0
7: 150m 99m 0 0 0 0 0 160 0 7 5 0 0 0
8: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
9: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
10: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
11: 0 0 0 0 0 0 0 0 0 0 0 2 0 0
12: 0 0 0 0 0 0 0 0 0 0 0 2 0 0
13: 0 0 0 0 0 0 0 0 0 0 0 2 0 0
14: 0 0 0 0 0 0 0 0 0 0 0 2 0 0
15: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
32: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
33: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
34: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
35: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
36: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
37: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
38: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
39: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
40: 99m 146m 0 0 0 0 0 666 0 6 796 7 0 0
41: 99m 149m 0 0 0 0 0 15k 0 2 303 4 0 0
42: 99m 152m 0 0 0 0 0 665 0 2 221 5 0 0
43: 99m 147m 0 0 0 0 0 16k 0 2 144 4 0 0
44: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
45: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
46: 0 0 0 0 0 0 0 0 0 0 0 2 0 0
47: 0 0 0 0 0 0 0 0 0 0 0 0 0 0
switch:admin>
Table 29 Loopback modes
Mode Description
1 Port Loopback (loopback plugs)
2 External (SERDES) loopback