some LUNS are not seen by the server

[maiques_2]

HI,
We have a VA7410 and servers HP (RP 7440 ?) connected to this array disks.
We use VM (Veritas Volume manager) on this servers.
If i use ioscan I see all the disks
If i use vxdisk list
5 disks are failed. These disks are LUN on VA7410 for instance ......39.0.1.7 c4t1d7 is lun 43
Disks are include in differents disks group.
For instance the first disk failed is include in disk group 1 the second disk failed is include in disk group 2 ......On the disk group there is oracle database
Can i use commands with graphic VM to reconnect disks to the server ? What i say to graphic VM is vea.
Thanks for your help.