Besides the vimsh (which I think that can do the job) you can delete the partition directly with fdisk (discover it using esxcfg-vmhbadevs, do an fdisk /dev/sdX and use the "d" option). If the VMFS partition have some trouble being removed an error message will show up at this point.

Marcelo Soares

VMWare Certified Professional 310

Technical Support Engineer

Linux Server Senior Administrator