Host missing from Vcenter 5.5

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
LVL 29
MAS (MVE)EE Solution GuideAsked:
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Christopher MilliganIT ManagerCommented:
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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Jackie ManCommented:
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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MAS (MVE)EE Solution GuideAuthor Commented:
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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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
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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Christopher MilliganIT ManagerCommented:
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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MAS (MVE)EE Solution GuideAuthor Commented:
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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Christopher MilliganIT ManagerCommented:
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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Christopher MilliganIT ManagerCommented:
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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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
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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MAS (MVE)EE Solution GuideAuthor Commented:
I need a separate license for 6.0 or 5.5 license is enough?

Please advise.
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Christopher MilliganIT ManagerCommented:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
New licenses are required for 6.0.

if you have support and subscription, you may be entitled to an upgrade.
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MAS (MVE)EE Solution GuideAuthor Commented:
Thanks to both
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