I updated the VMware version on a Dell T710 last night from 5.5 Update 2 to 6.0 Update 2. This morning I see a warning/alert on that ESXi host stating "Deprecated VMFS Volume(s) found on host. Please consider upgrading volumes(s) to the latest version.".
I recall during the update process there was a prompt stating that some of the volumes could not be updated related to VMFS. The consultant I worked with stated that the warning was probably due to the fact that the VMware update is being applied to an SD card and its not a big deal.
I did as little google searching and found out that I may just need to restart the management services. https://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2109735
What do you guys think? Any other thoughts regarding this warning? We do not have a SAN hence If I update a patch I will have to power off all of the VM's and then restart the ESXi host.