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vSphere iSCSI software adapter details are blank after recent network change

Posted on 2013-01-29
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Last Modified: 2013-04-15
Hi All,

Hope you can help I have recently teamed two NIC links from my SAN into the switch and done so retaining the same IP address.  After having done this I have lost access to datastores etc and have noticed that the details section below the Software iSCSI adapter is blank.  Re-adding the SAN in the adapter properties seems to make no difference, even restarting the SAN or ESXi box makes no difference.

just to clarify the adapter itself can see the SAN and shows as connected at both the SAN and ESXi end

Any idea's, thanks in adance.
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Question by:lukeglazebrook
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by:Andrew Hancock (VMware vExpert / EE MVE)
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do the LUNs appear under storage devices?

can you ping and vmkping the SAN IP Address from the ESXi console? (login via ssh)
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Author Comment

by:lukeglazebrook
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I will try and ping it mate and report back, thanks for the suggestion.  Thank sort of implies vSphere would add a SAN without validating it first.

Just to clarify the SAN does report that 192.168.0.250 (the ESXi box) can established a connection so I am assuming the ping will be sucesful.
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by:Andrew Hancock (VMware vExpert / EE MVE)
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okay, so there is a connection being made from ESXi Server to SAN.

can you check Storage Devices for any LUNs?
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Author Comment

by:lukeglazebrook
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I have attached a screenshot of the ping response and vSphere view mate I really dont know if its helps or not?

With reference to your comment below...

"can you check Storage Devices for any LUNs?"

Are you suggesting I create a new test LUN and additional target to see if that resolves the issue?  I have a feeling I tried it last night to no avail however I will try again in a moment and report back.
pingresponse.JPG
Where-have-my-LUNS-gone.JPG
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Author Comment

by:lukeglazebrook
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incidentally this is not really a production enviroment so I can do anything required to try and fix this.  Would rather not rebuild the ESXi box and reconfigure if I can avoid it however
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by:Andrew Hancock (VMware vExpert / EE MVE)
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could you try vmkping.
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Author Comment

by:lukeglazebrook
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"vmkping."

i have just looked this up (sorry I am a bit of a ESXi newbie).  I will give this a go in a couple of hours apparently I will have to slightly amend the standard commands since I am using 9000k jumbo frames thoughout my network.  See below...

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1003728

After having read this its got me wondering if jumbo frames could be causing the issue.
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by:Andrew Hancock (VMware vExpert / EE MVE)
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if you are using jumbo frames, it does not normally stop a LUN being discovered, as you have a connection to the SAN.

have you checked the LUNs have been presented correctly to the server, most SANs you have to allocate permission to the LUN, by IP Address, Hostname or IQN

here are some EE Articles and videos, I've create to check your settings


HOW TO: Add an iSCSI Software Adaptor and Create an iSCSI Multipath Network in VMware vSphere Hypervisor ESXi 4.1

HOW TO: Add an iSCSI Software Adaptor and Create an iSCSI Multipath Network in VMware vSphere Hypervisor ESXi 5.0

HOW TO: Enable Jumbo Frames on a VMware vSphere Hypervisor (ESXi 5.0) host server using the VMware vSphere Client

Video Tutorial - Adding iSCSI storage to a VMware vSphere ESX/ESXi 4.x host server
http://andysworld.org.uk/2011/06/24/new-hd-video-adding-iscsi-storage-to-a-vmware-vsphere-esxesxi-4x-host-server/
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Author Comment

by:lukeglazebrook
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the target LUN permissions and and all configuration on the same besides NIc teaming and jumbo frames have remained unchanged.  I will however read those links in a couple of hours mate regardless thanks.
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Author Comment

by:lukeglazebrook
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I have just noticed somthing interesting the SAN is not consistantly reporting the ESXi box as connected.  Its intermitantly disconnecting according to the SAN web gui the status keeps changes from ready to connected every 20 seconds or so.
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Author Comment

by:lukeglazebrook
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ping response does not look promising, are you able to clarify my results mate.  Do I did to change to a specific directory to initiate the ping command?  the reason I ask is I get the response "vmping: not found" and I dont know if that means...

A - The ping tool could not be found

or

B - There was simply no response to the ping sent
pingresponse.JPG
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LVL 117

Expert Comment

by:Andrew Hancock (VMware vExpert / EE MVE)
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it's called vmkping.
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Author Comment

by:lukeglazebrook
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Whoops ! I will report back
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Author Comment

by:lukeglazebrook
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Ok,

attached are my vmkping results I performed the command on both its regular form and its jumbo frame command variation.

I got a response however only in the standard rendition of the command not the jumbo frame variation (not sure if thats relevant)
pingresults.JPG
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Accepted Solution

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lukeglazebrook earned 0 total points
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You wont believe what this turned to be.  On my Cisco switch the ports are all numbered inversely ie front left labelled port 1 is actually port 8 on the reverse.  

As such I was configuring the incorrect ports for teaming, doh!   Does this only seem illogical to me?  Has this caught anyone else out before?
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by:Andrew Hancock (VMware vExpert / EE MVE)
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yes, incorrect teamed nics would cause this issue, as packets would not be reaching the SAN correctly.

you could always use CDP on VMware ESXi to check which ports you are actually connected to!
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Author Closing Comment

by:lukeglazebrook
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None of the answers were relevant in this particular scenario.
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