srvctl config service -d test -s testsrv
Service name: test
Server pool:
Cardinality: 2
Disconnect: false
Service role: PRIMARY
Management policy: AUTOMATIC
DTP transaction: false
AQ HA notifications: true
Global: false
Commit Outcome: false
Failover type: SESSION
Failover method:
TAF failover retries: 180
TAF failover delay: 5
Connection Load Balancing Goal: LONG
Runtime Load Balancing Goal: NONE
TAF policy specification: BASIC
Edition:
Pluggable database name:
Maximum lag time: ANY
SQL Translation Profile:
Retention: 86400 seconds
Replay Initiation Time: 300 seconds
Session State Consistency:
GSM Flags: 0
Service is enabled
Preferred instances: test1,test2
Available instances:

TEST =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = testsrv-scan.idfcbank.com)(PORT = 1653))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = TEST)
    )
  )


testsrv =
  (DESCRIPTION =
    (LOAD_BALANCE = ON)
    (FAILOVER = ON)
    (ADDRESS = (PROTOCOL = TCP)(HOST = testsrv-scan.idfcbank.com)(PORT = 1653))
    (CONNECT_DATA =
      (SERVICE_NAME = testsrv)
      (FAILOVER_MODE =
        (TYPE = SELECT)
        (METHOD = BASIC)
        (RETRIES = 180)
        (DELAY = 5)
      )
    )
  )

1* select inst_id,username,service_name,failover_type,failover_method,failed_over from gv$session where username='SYS'

1 SYS                            SYS$USERS                                                        NONE          NONE       NO
     1 SYS                            SYS$USERS                                                        NONE          NONE       NO
     1 SYS                            SYS$USERS                                                        NONE          NONE       NO
     1 SYS                            SYS$USERS                                                        NONE          NONE       NO
     1 SYS                            testsrv                                                      NONE          NONE       NO
     2 SYS                            SYS$USERS                                                        NONE          NONE       NO
     2 SYS                            SYS$USERS                                                        NONE          NONE       NO
     2 SYS                            SYS$USERS                                                        NONE          NONE       NO

NAME                                 TYPE        VALUE
db_unique_name                       string      test