Have you been referring to this guide?:
http://cdn.procurve.com/training/Manuals/2910-ATG-Feb09-2-VLAN.pdf
"show vlan ports" would be my next check to make sure you have the 3 ports connected to your ESXi hosts in the 2121 vlan.
As Duncan has said if you have VLAN ID on the portgroup in the vSwitch and you have the port on the pSwitch as trunk not acess and that VLAN ID is allowed on the pSwitch trunk port you should be ok. Just to clarify trunk is 802.1q not 802.3ad.
The other way is not VLAN ID on the vSwitch portgroup, use access port on the pSwitch with VLAN ID. Limits pSwitch port to one VLAN, this may be ok for you?