I got the following health status when logging in to vCenter Server Appliance console the other day. Not quite sure how to proceed to fix this. Using the Google machine, there are several scenarios where you could clear out the files or expand the drive size.
Different folder: The / filesystem is low on disk space or inodes VCSA
Increasing Drive Size VCSA 6.0: Increasing the disk space for the VMware vCenter Server Appliance in vSphere 6.0 (2126276) | VMware ...
Deleting Files VCSA 6.0U1: How to Fix /storage/core filesystem Out of Disk Space Error on VCSA 6.0U1
This is what I'm seeing in my /storage/core folder:
I'm not sure if it's safe to clear out the folder, or to expand the drive. I'm afraid there's another issue that is causing the folder to fill up, so either of these "fixes" may just be a bandaid to the underlying issue.
Is it possible those are email dumps because snmp alert emails aren't getting sent out due to the bug with the smtp script? We ran in to something similar when we discovered our email alerts werent sending and had over 50k queued emails.
Check out this kb. It said 6.5, but we saw the issue with 65u1 too. -- Email alerts for alarms are not delivered on vCenter Server Appliance 6.5 (2148396) | VMware KB
Also- FWIW, check out /var/spool/mqueue/ on your vcsa(s)... ours had over 50k messages waiting to be sent.