Unable To Start Database: ORA-15001, ORA-15055

(Doc ID 1448048.1)

Last updated on JANUARY 02, 2018

Applies to:

Oracle Database - Enterprise Edition - Version and later
Information in this document applies to any platform.
***Checked for relevance on 11-Sep-2013***


Unable to start up the RAC database instances:

Mon Apr 09 23:27:45 2012
ASMB started with pid=43, OS id=13441
ORA-00210: cannot open the specified control file
ORA-00202: control file: '+DATA/fhruat/datafile/cntrl03.dbf'
ORA-17503: ksfdopn:2 Failed to open file +DATA/fhruat/datafile/cntrl03.dbf
ORA-15001: diskgroup "DATA" does not exist or is not mounted
ORA-15055: unable to connect to ASM instance

All ASM instances (clustered) are up and running and have all needed ASM disk groups mounted.


Upgraded the Grid Infrastructure (GI) home from to


Sign In with your My Oracle Support account

Don't have a My Oracle Support account? Click to get started

My Oracle Support provides customers with access to over a
Million Knowledge Articles and hundreds of Community platforms