ORA-15003 Diskgroup "DATA" Already Mounted in Another Lock Name Space (Doc ID 1531734.1)

Last updated on OCTOBER 31, 2016

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.1 to 11.2.0.3 [Release 11.2]
Information in this document applies to any platform.

Symptoms

1. ASM diskgroups in single instance environment will not be mounted with the following similar error in sqlplus screen.

SQL> alter diskgroup DATA mount;
alter diskgroup DATA mount
*
ORA-15017 diskgroup DATA cannot be mounted
ORA-15003 diskgroup DATA already mounted in another lock name space

2. Heartbeat detection error is seen In ASM alert.log,

Mon Nov 03 15:11:11 2012
SQL> alter diskgroup DATA mount
NOTE: cache registered group DATA number=1 incarn=0x3866aca2
NOTE: cache began mount (first) of group DATA number=1 incarn=0x3866aca2
Mon Nov 03 15:11:31 2012
NOTE: Assigning number (1,0) to disk (/dev/asm/data1)
NOTE: Assigning number (1,1) to disk (/dev/asm/data2)
Mon Nov 03 15:11:38 2012
ERROR: PST found another heartbeat (grp 1)                                     <<<<<<--- Heartbeat detected.
NOTE: cache dismounting (clean) group 11/0x3866ACA2 (DATA)
NOTE: dbwr not being msg'd to dismount
NOTE: lgwr not being msg'd to dismount
NOTE: cache dismounted group 1/0x3866ACA2 (DATA)
NOTE: cache ending mount (fail) of group DATA number=1 incarn=0x3866aca2
kfdp_dismount(): 87
kfdp_dismountBg(): 87
NOTE: De-assigning number (1,0) from disk (/dev/asm/data1)
NOTE: De-assigning number (1,1) from disk (/dev/asm/data2)
ERROR: diskgroup DATA was not mounted

 

Cause

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