it's the VCM device,  when your TC creates a bin file they like to map VCM to all FAs on the array. This device does not have to be masked to appear on the host, any host zoned to that FA will see this device. The only way to get rid of it is to unmap it from the FA. Like i mentioned above if this VCM device has already been discovered by other systems, it may require some clean up before/after you unmap this device from the FA.
I have a new AIX 6x server connecting to a dmx4.  We have not installed Power Path yet. I have mapped and masked 39 8-way striped meta volumes to the HBAs and storage ports.  When I run lsdev -Cc disk it shows me 40 FC disks.  I beleive one is a very small disk - maybe a VCM disk.  It is showing up as hdisk0.  If I remove this disk with rmdev -Rdl hdisk0, it will show up again on the next reboot or cfgmgr.  Can I get rid of this disk?  I never mapped or masked this disk to the host.
VCM disk?