I was reading the article How NPIV-Based LUN Access Works and noticed the note:
<span class="zNoteHeads">Note be zoned to the virtual machine by the SAN administrator. This is required to support multipathing even though only one path at a time will be
active.
This is a bit unclear. The rest of the article reads as though, through NPIV, that up to four virtualized physical paths can be presented up through to the VM. It reads as though these paths would be candidates for VM OS multi-pathing to manage the paths it sees. Thus, were someone using, say, Veritas Volume Manager within the VM, that DMP could function as it would normally function in a physical version of the OS. However, the final part of that note reads as though only one of the paths presented to the VM would be active and usable. Is this the case, or are all paths that the VM sees actually active?
I guess what I'm asking is, if my ESX server has four HBAs and I present four HBAs to my VM, will a multipathing driver in the VM be able to take advantage of those four paths out of the ESX server?
