ORA-15003 Diskgroup "DATA" Already Mounted in Another Lock Name Space
(Doc ID 1531734.1)
Last updated on AUGUST 04, 2018
Applies to:Oracle Database - Enterprise Edition - Version 126.96.36.199 and later
Information in this document applies to any platform.
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,
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
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
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