Notes from the field: VMware vCenter /dev/mapper/core_vg-core full

Not too long ago I’ve encountered an vCenter instance blowing up the /dev/mapper/core_vg-core with gigabytes of java dump errors.. Just for reference the customers setup is an dual SDDC with respectively an vCenter at each site comprising of vCenter 6.5 U2 and embedded linked mode enabled.

In troubleshooting mode I’ve encountered the following two articles:

https://kb.vmware.com/s/article/2150731

https://kb.vmware.com/s/article/60161

Afterwards decided to open up a support case. This resulted in a session which stated that they had seen this sort of issues arising in 6.7u1 and higher which root caused against hardware level 13 for the appliance and WIA Active Directory integration.

The customer setup had an hardware level 13 deployment on both sites and only one experiencing the problem, and using Active Directory over LDAP integration.

The resolution of the issue was downgrading the VCSA hardware level to version 10.

Supports way is restoring the VCSA with a VAMI back-up restore, my way was re-register the appliance with the VMX file downgraded to the level needed, see https://communities.vmware.com/thread/517825

Hope this helps!

Author: hheres

IT Pro / Geek