Uplinks of Virtual Connect

[Simon1975]

Hey

I'm running 20 ESXi servers (Vsphere 6). 16 ESXi servers installed within C7000 enclosure with Virtual Connect stack. 

Inside VC stack we are running 50 VLANs. one of these VLANs is iSCSI. 

VC stack connected with 4 10G uplinks aggregated by pairs to Juniper 4550 stack. There are other ESXi servers connected to the same Juniper stack with 1GB interfaces (Dell PE630)

Question:

What should be the MTU on Juniper switches for uplink ports ? If these were dedicated ports for iSCSI VLAN, I would configure them with MTU 9000, however these are SHARED UPLINKS  

Thanks

Simon