AIX hdisk and vpath

Hello John,

    Just updating this and see Stefano has already answered, here is another explanation I have come accross:

Vpaths come from the SDD (Subsystem Device Driver) software which is installed on the server. It can be used if you have a SAN, SCSI or point-to-point fibre connections. The vpaths give you multiple routes to each LUN, so if one path fails, you can still access the disk via another path. 

SDD creates pseudodevices named vpath that are abstractions of several disks seen by one or more paths (HBAs or SCSI adapters) so you will find the PVID and VG names in the vpath definitions.

lspv command will show all HDD devices connected and will show correspondence between VG and PVID and vpath names.

You can see which hdisks belongs to which vpath by issuing the lsvpcfg command

Hope this helps,

   Nollaig