Server Fault is a question and answer site for system and network administrators. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

On a VMware ESXi 5.0 host, how can I check if fiber storage adapters are properly connected to the fiber switch/SAN, i.e. if the fiber link is up?

share|improve this question
and you can't trace the fiber to the switch port? – tony roth Feb 1 '12 at 12:53
Unfortunately, no. Cabling and storage are managed by different people here. – Massimo Feb 1 '12 at 13:08
up vote 3 down vote accepted

This information is shown nowhere in the vSphere Client, and there is no command-line tool to check it, either.

The only way to verify if a fiber link is up is to access the ESXi shell and go to /proc/scsi/your_hba_driver (in my case, /proc/scsi/qla2xxx); there is a (virtual) file there for each fiber port, and the contents of these files include one of the following:

For an active link:

Host adapter:Loop State = <READY>, flags = 0xaa68  
Link speed = <8 Gbps>

For an inactive link:

Host adapter:Loop State = <DEAD>, flags = 0x1a268
Link speed = <Unknown>
share|improve this answer

Select the host, look at the Configuration tab, chose Storage Adapters, select each HBA, refresh, check that both HBAs have the same number of targets/LUNs then if needed select each LUN and look at their paths.

Alternative look under Configuration, Storage, select a datastore then look at Properties and Manage Paths.

share|improve this answer
No target is showing up at all. But I don't know if this is due to cabling, zoning or the SAN itself (I don't manage any of those). So, first thing first, I'd like to check cabling. – Massimo Feb 1 '12 at 11:53
Downvoting because I want to check the actual fiber link, not targets/LUNs; I want something like the link status for network adapters. – Massimo Feb 1 '12 at 12:13
There's nothing in the GUI to show you pure link state and there's certainly nothing to show if the HBA is in a zone but if you do go to the ESXi console and look in /proc/scsi/whateverdriver you can 'cat' the files and see their link state - that's quite complex for most users but it's the only way of doing it AFAIK – Chopper3 Feb 1 '12 at 12:49
kinda strange that you have to drop to the host level to see this it should be exposed within the vcenter. – tony roth Feb 1 '12 at 12:59
Agree, they show link level for NICs but not for FC - ah well, easy to do once you know how but you're right. – Chopper3 Feb 1 '12 at 13:02

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.