The path of the physical volume refers to a device that does not

[Jimesh_Makawana]

Disk are not mounted after add external SAN Switch between Bladecenter SAN Switch & Storage.

#
# pvdisplay -v /dev/dsk/c4t0d7
pvdisplay: Warning: couldn't query physical volume "/dev/dsk/c4t0d7":
The specified path does not correspond to physical volume attached to
this volume group
pvdisplay: Warning: couldn't query physical volume "/dev/dsk/c2t0d7":
The specified path does not correspond to physical volume attached to
this volume group
pvdisplay: Warning: couldn't query the list of physical volumes.
pvdisplay: Couldn't retrieve the names of the physical volumes
belonging to volume group "/dev/vg01".
pvdisplay: Cannot display physical volume "/dev/dsk/c4t0d7".
#

[Masghar]

First you should check if you didn't lost your paths to disks after topology change:

You should check zoning and make sure your host wwn's are visible on storage.

you can run "ioscan -fnC disk" as root to confirm if disks are showing claimed?

Second you should check if disk names have changed after FC patch change. in this case run insf -eC disk and verify same disks are present with different names. storage utilities can help confirm this using disk UUID from storage.

Good Luck!