Hi eltuga, Officially the 2950 is not supported by VMware to run vSphere 6, see [URL] [IMAGE] Furthermore the Dell OpenManage Integration for VMware vCenter also does not support the 2950 anymore see the Compatibility Matrix [URL] 
We just updated OMIVV to 3.0 release. We are having problems with 3 hosts in our infrastructure - all M610's running ESXi 5.5 U2 P55.  All hosts report strangely in OMIVV. - "Unsupported Hypervisor" is reported in the "Check hosts for compliance" screen. - We can update firmware on individual hosts, but updating multiple hosts at the cluster level does not work at all.  The firmware inventory page displays nothing. All other features seem to work fine on these hosts and all of our M620's are not acting in the same way in OMIVV.  All firmware is quite up-to-date already on all hosts.
OMIVV 3.0 - "Unsupported Hypervisor" errors, can't update multiple hosts 
firmware on M610 / ESXi 5.5 U2