Your ESXi host becomes disconnected from the vCenter after the backup completes, but you see no problem in vRanger. The ESXi host show some of the following problems:
1. Host might disconnect from the Virtual Center+
2. When you try to reconnect the host might fail
3. Host not responding to vSphere Client
4. Rebooting the host resolves the issue temporarily
5. When you run df -h you do not see the host running out of space
There might be a possible problem with an inode error on the ESXi host. You will need to check the /var/log/vmkernel.log, and you will see a reference to the following:
WARNING: XXxxXX: xxxx: Cannot create file /var/spool/snmp/xxxxxxxx_x_x_xxxx.trp for process hostd-worker because the inode table of its ramdisk (root) is full.
WARNING: XXxxXX: xxxx: Cannot create file /var/run/vmware/tickets/vmtck-xxxxxxxx-xxxx-xx for process hostd-worker because the inode table of its ramdisk (root) is full.
**This can happen when the ESXi host RAM disk that hold the root file system reaches a resource pool limit.
**Files on the affected RAM disk can no longer be extended.
**Various administrative actions depend on the ability to write files to various parts of the root file system and might fail if a RAM disk is full.
Check the “/var/spool/snmp/” you will see a bunch of .trp files shown in the directory. These files can be removed, but there is no batch mode operations allowed to run. So you will need to remove these files WINSCP is good to use for this with it allowing you to select multiple folders to delete.
http://winscp.net/eng/index.php
Once the .trp files have been removed you can try to reconnect the host again to the Virtual Center.
