Trying to start up a database, and got the following error messages:
$ srvctl start database -d testdb PRCR-1079 : Failed to start resource ora.testdb.db CRS-2640: Required resource 'ora.DSGRP123.dg' is missing.
$srvctl config database -d TESTDB ... .. . PRCD-1012 : Failed to retrieve disk group list for database TESTDB. PRCR-1035 : Failed to look up CRS resource ora.DSGRP123.dg for TESTDB PRCA-1000 : ASM Disk Group DSGRP123 does not exist
SOLUTION
$ srvctl modify database -d TESTDB -a "+DATA1,FRA"
$ srvctl start database -d TESTDB