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Please see below which could be helpful for your issue
Disk Is not Discovered in ASM, Diskgroup Creation Fails with Ora-15018 Ora-15031 Ora-15014 [ID 431013.1]
ASM Is Not Detecting EMC PowerPath Raw Devices Or Regular Raw Devices On AIX [ID 1174604.1]
Asm Is not Discovering Disks On Solaris: ORA-15025 ORA-27041 SVR4 Error: 5: I/O error (Doc ID 1300393.1) [ID 1300393.1] <<applicable for linux also
By the way you can also move your issue to Forum Home » Grid Computing » Automatic Storage Management
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Please check the permissions; also you can read MOS ID: Problem : Disk Is not Discovered in ASM, Diskgroup Creation Fails with Ora-15018 Ora-15031 Ora-15014
Hope it helps!
Thanks for answer ... I have found the solution
For ASMCA I set /dev/oracleasm/disks/* insted ORCL:*
Edited by: 895064 on 04.11.2011 3:45
Can someone please elaborate what exactly was changed ?