oracleasm can not be found

When I bounce the server per completion of an grid install the ASM disk group disappeared.

When I tried to create ASM disk group DATA and RECO, I received this error message:

"

CREATE DISKGROUP DATA NORMAL REDUNDANCY

 DISK '/dev/mapper/mpatha'; no good

CREATE DISKGROUP DATA NORMAL REDUNDANCY

*

ERROR at line 1:

ORA-15018: diskgroup cannot be created

ORA-15031: disk specification '/dev/mapper/mpatha' matches no disks

ORA-15025: could not open disk "/dev/mapper/mpatha"

ORA-27041: unable to open file

Linux-x86_64 Error: 13: Permission denied

Additional information: 42

Additional information: 309868608

Additional information: 1082

"

So I check the for the disk :ls -al /dev/mapper/mpatha