VMware - Cannot reconnect ESXi Host in Vcenter

This morning I came in to find that one of my ESXi hosts is disconnected in vCenter.  Attempting to reconnect gives the following error:

Cannot contact the specified host.  The host may not be available on the network, a network configuration problem may exist or the management services on this host may not be responding.

Following the VMware KB procedures in " Restarting the Management agents on an ESXi or ESX host (1003490)" i tried restarting the management agents via the DCUI.  I pressed F2 and received a login prompt.  I enter the root credentials and pressed Enter.  The screen went back to the default splash screen and now hitting F2 does nothing (nor does hitting F12).

Continuing to follow the same KB article, I tried restart the management agents via SSH and received errors about "no space left on device"  (See attached Image).  There is 1.5TB free on the VMFS-5 volume.

Can anyone suggest how to proceed with regaining connectivity of the host to vCenter or the viClient?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
The lack of space, is probably the space on the ESXi installation partitions.

try removing the logs.
CipherUserAuthor Commented:

That's a great idea! Could you please point me to the location of the logs that can be safely deleted?  

Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:

and you can remove all the tar balls or copy them off via SCP.

you may need to reboot, if the services have hung1
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CipherUserAuthor Commented:

There doesn't seem to be any space to recover in the /var/log directory (See 1st image).

Also, I found out that I'm out of inodes using VMware KB article: ESXi/ESX error: No free space left on device (1007638).  I ran the command they suggested to find large files to delete, but none of them look like good candidates (See 2nd Image).

You are dead on that I need to delete files, but deleting anything in the /var/log directory doesn't look like it will free up more than a few KBs.

Do you have any other suggestions on how to free up some space after seeing the images I posted?

Thanks in advance for your help!!
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
do you have any third party VIBS or management installed ?
CipherUserAuthor Commented:
No third party VIBs or managament installed.  I do use Veeam Backup and Recovery, but it's installed on a separate physical server.
CipherUserAuthor Commented:
I found the root cause of the problem here: http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2037798

After following the directions in the KB article, I was able to reconnect the ESXi host to vCenter.

Thanks for your help Andrew!

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CipherUserAuthor Commented:
Andrew was correct in determining that the ESX partition was full thus the awarding him all the points.  My last comment with the KB link was the actual fix that allowed the ESX server to be reconnected.  Selected it as the Best Solution so that others would benefit from it as well as I did.
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