Paths not visible to guest OS

[srini7]

I have a setup, where multiple paths are present at host level. These paths can be seen through vSphere client. 


Same paths are not visible in guest OS (using RHEL6). Only one path is seen. Device Mapper (DM) multipath is being used with RHEL.


My requirement is see all the paths at the guest.


Will NPIV configuration will help here?


VMware NPIV documentation says, “If a host uses multiple physical HBAs as paths to the storage, zone all physical paths to the virtual machine. This is required to support multipathing even though only one path at a time will be active.”


Does that mean that all the paths will be visible to the guest OS. I have tried the NPIV setup, but unable to get the paths at VM level.


Any help or related pointers will be appreciated.


Thanks & Regards,


 

[srini7]

Some more information to above query,


I am performing SCSI3 PR operations on the disks (using RDM). Since only one path is visible at guest, PR registration is done on only that path and then PR reservation is performed. If that path fails at host, path switching will happen. The new path is not registered, so the I/Os through that path will start failing. I am looking for a solution here, if I can see all the paths at guest level or there is some other recommendation ?


PS : We have already ruled out VMDirectpath approach.


Thanks & Regards,