firewall - Multiple blades in one chassis, some in DMZ, some in internal network

This question is similar to:
Blade Enclosure, Multiple Blade Servers, Whats the closest approximation to a DMZ?

In my case, I don't have virtualization so I cannot use vLANs as suggested in answers to the question above.

So I have several blades in one single chassis. Some of the blades shall be part of the DMZ and some shall be in the internal network (behind the DMZ).

Is there a security issue as all blades are interconnected via the chassis? Shall I run a firewall on each blade to limit access to the internal chassis network?

I will use HP blades running Linux.

Answer

Virtualization isn't a prerequisite for using VLANs, you just need switch support for VLANs which your HP blade system will almost certainly have.

In most cases you can configure the internal switch which each blades network interfaces connect to on a port by port basis and VLAN at that point giving you the separation you're after.