大早上起来测试一波fsfl，遇到一个小问题记录一下。

DGMGRL> 
DGMGRL> show configuration;

Configuration - dg_config

  Protection Mode: MaxAvailability
  Members:
  orcl   - Primary database
    Error: ORA-16820: fast-start failover observer is no longer observing this database

    orcldg - (*) Physical standby database 
      Error: ORA-16820: fast-start failover observer is no longer observing this database

Fast-Start Failover: ENABLED

Configuration Status:
ERROR   (status updated 26 seconds ago)

DGMGRL> 
DGMGRL> 
DGMGRL> show configuration;

Configuration - dg_config

  Protection Mode: MaxAvailability
  Members:
  orcl   - Primary database
    Error: ORA-16820: fast-start failover observer is no longer observing this database

    orcldg - (*) Physical standby database 
      Error: ORA-16820: fast-start failover observer is no longer observing this database

Fast-Start Failover: ENABLED

Configuration Status:
ERROR   (status updated 20 seconds ago)

DGMGRL> start observer;
[P001 02/27 07:04:10.37] Authentication failed.
DGM-16979: Unable to log on to the primary or standby database as SYSDBA
Failed.
DGMGRL> connect sys/sys   ##这里需要注意一下，使用sys用户连接
Connected as SYSDG.
DGMGRL> start observer
Observer started

#再次查看
[root@roidb01 ~]# su - oracle
Last login: Tue Feb 27 06:45:19 CST 2018 on pts/0
$dgmgrl /
DGMGRL for Linux: Version 12.1.0.2.0 - 64bit Production

Copyright (c) 2000, 2013, Oracle. All rights reserved.

Welcome to DGMGRL, type "help" for information.
Connected as SYSDG.
DGMGRL> show configuration;

Configuration - dg_config

  Protection Mode: MaxAvailability
  Members:
  orcl   - Primary database
    orcldg - (*) Physical standby database 

Fast-Start Failover: ENABLED

Configuration Status:
SUCCESS   (status updated 25 seconds ago)

DGMGRL>