failed to establish dependency between database GERP and diskgroup resource
....
Post SMON to start 1st pass IR
Submitted all GCS remote-cache requests
Post SMON to start 1st pass IR
Reconfiguration complete
ORACLE_BASE from environment = /u01/app/oracle
Wed Sep 11 12:30:38 2013
ALTER DATABASE MOUNT
NOTE: Loaded library: System
SUCCESS: diskgroup DATA was mounted
ERROR: failed to establish dependency between database GERP and diskgroup resource ora.DATA.dg
ORA-1079 signalled during: ALTER DATABASE MOUNT...
Wed Sep 11 12:30:47 2013
SUCCESS: diskgroup DATA was dismounted
查了Metalink , 可能是bug （ID 1474954.1）， 查询其他论坛或博客上的文章 ，重新启动另外一个共享ASM diskgroup的数据库实例即可 （参考http://yangtingkun.itpub.net/post/468/523429）。
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Metalink的描述：
Alert logfile of the database shows the error as follows:-
ERROR: failed to establish dependency between database
This error is harmless.
Documented in Bug 8304720
Abstract: ERROR: FAILED TO ESTABLISH DEPENDENCY BETWEEN DB & DISKGROUP
This is an internal BUG.
The db-dg dependency will be created later on if the diskgroup is used by the db again; the dependency can also be created manually through cmdline tool.
Automatically it will resolve itself later on when the db tries to use the diskgroup. Or we can manually establish the dependancy through any command line utility.
For establishing dependencies between database and diskgroups, please use DB home owner running srvctl from DB home with
$ srvctl modify database -d
For example:
$ srvctl modify database -d db112 -a "DATA,FRA"
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/35489/viewspace-772556/ ，如需转载，请注明出处，否则将追究法律责任。
