?
Solved

Facing issue with connecting ports - no_light

Posted on 2014-02-05
4
Medium Priority
?
1,390 Views
Last Modified: 2014-02-21
Hi ALL,

One strange issue is there - one of RHEL 6.2 physical server with DL380 G8 hardware ......HBA showing online but there were no connecting port are not online gives below message :

id    N4   No_Light
id    N4   No_Light
id    N4   No_Light

what does it mean and what is the problem and its solution? - is it from network/SAN or OS? please advice
0
Comment
Question by:apunkabollywood
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
4 Comments
 
LVL 47

Expert Comment

by:David
ID: 39839711
HDD LEDs are controlled by the RAID controller.
0
 
LVL 56

Accepted Solution

by:
andyalder earned 900 total points
ID: 39839946
No_Light is a Brocade switch port status and means exactly that, there's an SFP transceiver in the port but no light going into it so maybe there isn't a fibre channel cable connected. Of course if it's a Brocade HBA then they may use the same No_Light status which again would imply it's not connected to the SAN. Bear in mind though that there can be power saving features where if it's powered up and the fibre is plugged in later it will have already shut down the port so in that case a power-cycle would fix it.
0
 
LVL 51

Assisted Solution

by:Netman66
Netman66 earned 600 total points
ID: 39840011
On one end of each fibre cable, reverse the leads.  If these are new cables, you may need to remove the tab connecting the pair of connectors to do this.

You need to have transmit on one end go to receive on the other and patch cables don't normally have the pairs crossed over.
0
 

Author Closing Comment

by:apunkabollywood
ID: 39876445
Thank you all - We have checked and found some driver issues - Thanks again
0

Featured Post

Get proactive database performance tuning online

At Percona’s web store you can order full Percona Database Performance Audit in minutes. Find out the health of your database, and how to improve it. Pay online with a credit card. Improve your database performance now!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Join Greg Farro and Ethan Banks from Packet Pushers (http://packetpushers.net/podcast/podcasts/pq-show-93-smart-network-monitoring-paessler-sponsored/) and Greg Ross from Paessler (https://www.paessler.com/prtg) for a discussion about smart network …
Is your phone running out of space to hold pictures?  This article will show you quick tips on how to solve this problem.
This tutorial will walk an individual through the process of installing the necessary services and then configuring a Windows Server 2012 system as an iSCSI target. To install the necessary roles, go to Server Manager, and select Add Roles and Featu…
How to Install VMware Tools in Red Hat Enterprise Linux 6.4 (RHEL 6.4) Step-by-Step Tutorial
Suggested Courses
Course of the Month9 days, 1 hour left to enroll

764 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question