listing disks in oracle grid cluster

[root@server ~]# ls -l /dev/oracleasm/disks/
total 0
brw-rw---- 1 grid oinstall 253, 31 Jun 19 18:25 VOLNP09
brw-rw---- 1 grid oinstall 253, 18 Jun 19 18:25 VOLNP10
brw-rw---- 1 grid oinstall 253, 19 Jun 19 18:25 VOLNP11
brw-rw---- 1 grid oinstall 253, 22 Jun 19 18:25 VOLNP12

[root@server ~]# oracleasm listdisks
VOLNP09
VOLNP10
VOLNP11
VOLNP12