CRS information was lost

Due to a crash a part of the CRS information was lost. Until now I have not found out how this could happen in the first place.
The effects were strange. The instances would not start and there was no indication of an error in the alert_log.

Doing some research in the CRS revealed that the ora.ORCL.db was gone while the ora.ORACL.oracl1.inst was still there.

Creating a new file in the CRS profiles and using crs_register did do the trick.

Such a file should look like this:

NAME=ora.ORCL.db
TYPE=application
ACTION_SCRIPT=/opt/oracle/crs/bin/racgwrap
PLACEMENT=balanced
CHECK_INTERVAL=600
RESTART_ATTEMPTS=1
FAILOVER_DELAY=0
FAILURE_INTERVAL=60
FAILURE_THRESHOLD=1
AUTO_START=1
SCRIPT_TIMEOUT=600
ACTIVE_PLACEMENT=0
OPTIONAL_RESOURCES=
REQUIRED_RESOURCES=
RESTART_ATTEMPTS=1
STOP_TIMEOUT=0
UPTIME_THRESHOLD=7d
HOSTING_MEMBERS=
USR_ORA_ALERT_NAME=
USR_ORA_CHECK_TIMEOUT=0
USR_ORA_CONNECT_STR=/ as sysdba
USR_ORA_DEBUG=0
USR_ORA_DISCONNECT=false
USR_ORA_FLAGS=
USR_ORA_IF=
USR_ORA_INST_NOT_SHUTDOWN=
USR_ORA_LANG=
USR_ORA_NETMASK=
USR_ORA_OPEN_MODE=
USR_ORA_OPI=false
USR_ORA_PFILE=
USR_ORA_PRECONNECT=none
USR_ORA_SRV=
USR_ORA_START_TIMEOUT=0
USR_ORA_STOP_MODE=immediate
USR_ORA_STOP_TIMEOUT=0
USR_ORA_VIP=