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Host missing from Vcenter 5.5

Posted on 2016-08-03
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Last Modified: 2016-08-09
Host missing from Vcenter 5.5.
I have configured 2 hosts now it is showing only 1 host. some of the VMs down and it is not displayed as well.
There was a error I saw yesterday and day before. Attached screenshot. My colleague restarted the host also.


Any ideas?
Your quick response is highly appreciated.
image001.png
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Question by:MAS
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13 Comments
 
LVL 51

Expert Comment

by:Jackie Man
ID: 41741820
Have you over provisioned your VMs?

How many VMs are in total for two hosts and the amount of physical memory for the hosts?
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LVL 27

Author Comment

by:MAS
ID: 41741829
Thanks for your reply first of all.
We have around 13 VMs equally distributed. 64GB on each host.
It was running past past 6 months
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LVL 124
ID: 41741899
has the host failed ?

does it show as not responding or disconnected in vCenter Server ?

can you ping the host, or connect via SSH or vSphere Client ?
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LVL 1

Expert Comment

by:Christopher Milligan
ID: 41741917
To reiterate Andrew's advice go and check the "faulty" host; make sure it's up and running and get onto the host using SSH or vSphere client to see what is really going on with the host.

If it is running and you can ping it then go back to vCentre, get into Hosts and Clusters, then right click on your cluster name and select Add New Host.  Follow the on screen instructions to add in the missing host.

Hope you get sorted.

Christopher
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LVL 27

Author Comment

by:MAS
ID: 41742274
I am sorry there was a miscommunication happened
Customer upgraded ESXi from 5.5 to 6.0 Which I guess the cause of the this problem. Which I am not aware of.

What is the next step if one ESXi 5.5 and one ESXi 5.5?
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LVL 1

Expert Comment

by:Christopher Milligan
ID: 41742278
Do you mean is one host is 6.0 and the other is 5.5?

Are both host independently accessible using a vSphere client?
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Accepted Solution

by:
Christopher Milligan earned 1000 total points
ID: 41742282
Sorry should have said is any host is on ESX 6.0 then the vcenter needs to be upgraded to match.  Vcenter 6.0 can manage ESX 5.5 hosts but vCenter 5.5 CANNOT manage 6.0 hosts.
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LVL 1

Expert Comment

by:Christopher Milligan
ID: 41742283
Hit submit a bit too quickly there!  Please see best practice notes from VMware

https://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2109772
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LVL 124

Assisted Solution

by:Andrew Hancock (VMware vExpert / EE MVE^2)
Andrew Hancock (VMware vExpert / EE MVE^2) earned 1000 total points
ID: 41742296
vCenter Server MUST be upgraded to 6.0 to Manage 6.0 Hosts!

see my EE Article

HOW TO: Upgrade from vCenter Server 5.5 to 6.0
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LVL 27

Author Comment

by:MAS
ID: 41744599
I need a separate license for 6.0 or 5.5 license is enough?

Please advise.
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LVL 1

Expert Comment

by:Christopher Milligan
ID: 41744628
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LVL 124
ID: 41744689
New licenses are required for 6.0.

if you have support and subscription, you may be entitled to an upgrade.
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LVL 27

Author Closing Comment

by:MAS
ID: 41748349
Thanks to both
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