Confusing with the Global Database Name and Instance Name

Dear fellow DBA's and Experts,
Good Day.
We presently have an existing database registered (on V2 Exadata) with global database name as BIDEV.domainname.com. It has 4 instances viz., BIDEV1 and BIDEV2 which have the same service name as the instance name.
Last week, on our new X4-2 Exadata, we tried to create a fresh database. While doing so, we entered the details as below in the installer:
Global Database Name: BIDEV
SID Prefix: BIDEV
Service Name: BIDEV.
Then upon the successful installation of the database, when we query
1. (SELECT * FROM GLOBAL_NAME), it shows BIDEV as the global database name.
2.
SQL> sho parameter service
NAME                                 TYPE        VALUE
service_names                        string      BIDEV1
3. Sho parameter name gives the below details:
SQL> sho parameter name;
NAME                                 TYPE        VALUE
cell_offloadgroup_name               string
db_file_name_convert                 string
db_name                              string      BIDEV
db_unique_name                       string      BIDEV
global_names                         boolean     FALSE
instance_name                        string      BIDEV_1
lock_name_space                      string
log_file_name_convert                string
processor_group_name                 string
service_names                        string      BIDEV1
Curious to know why it created an instance name as BIDEV_1 instead as BIDEV1.
Had tried another attempt on our test environment with SID prefix as BIDEV1, then the instance was created with the name as BIDEV1_1.
Also, would like to know what happen if we give the Global Database Name as BIDEV.domainname.com for installing the same BIDEV database on a different server while the 1st server is still functional.
Appreciate if someone could throw some light on the above confusion. Any reference material or source to the clarify the doubt.
Warm Regards,
Vikram.

Hi Vikram,
Your clustered database is not full RAC, it's RAC ONE node database. In RAC ONE node database, instance names are created in that format only (i.e.e dbname_1), I don't know if there is any way we can change it to dbname1. OR if you really want to change the instance name to dbname1 format, then you can convert RAC one node database to Full RAC, then remove instance and add another instance, I hope it would be added in dbname1 format. I have not tested it, test it on your test system first.
You can find the database type in the output you shared,
Type: RACOneNode
Regards,
Saurabh

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