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ASM is not Discovering Disks on Solaris: ORA-15025 ORA-27041 SVR4 Error: 5: I/O error. (Doc ID 1300393.1)

Last updated on AUGUST 04, 2018

Applies to:

Oracle Database - Enterprise Edition - Version to [Release 10.2 to 12.1]
Oracle Solaris on x86-64 (64-bit)
Oracle Solaris on SPARC (64-bit)
***Checked for relevance on 24-Mar-2015***


1) Unable to add a new disks to existing diskgroups or unable to create new diskgroups using new disks due to the next errors (on Solaris):

SQL> create diskgroup testdg external redundancy disk '/dev/rdsk/c4t60060480000190103592533031453837d0s2';
create diskgroup testdg external redundancy disk '/dev/rdsk/c4t60060480000190103592533031453837d0s2'
ERROR at line 1:
ORA-15018: diskgroup cannot be created
ORA-15031: disk specification
'/dev/rdsk/c4t60060480000190103592533031453837d0s2' matches no disks
ORA-15025: could not open disk
ORA-27041: unable to open file
SVR4 Error: 5: I/O error
Additional information: 42
Additional information: 0
Additional information: 103997248

2) Disks have the correct ownership and permissions:

SQL> !ls -l /dev/rdsk/c4t60060480000190103592533031453837d0s2
lrwxrwxrwx 1 root root 67 Feb 22 20:53 /dev/rdsk/c4t60060480000190103592533031453837d0s2 ->


SQL> ! ls -l /devices/scsi_vhci/ssd@g60060480000190103592533031453837:c,raw
crw-rw---- 1 oracle dba 118, 338 Mar 2 09:48


3) Also, it can be discovered by ASM:

SQL> show parameter asm

------------------------------------ ----------- ------------------------------
asm_diskgroups string LOANIQ_REDO01DG01, LOANIQ_REDO
asm_diskstring string /dev/rdsk/*

asm_power_limit integer 1

SQL> select path from v$asm_disk;


4) And the disk can be accessed at OS level using dd:

SQL> !dd if=/dev/rdsk/c4t60060480000190103592533031453837d0s2 of=/dev/null count=100 bs=8192
100+0 records in
100+0 records out


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