Discovery Help !!

[SandeepKSingh]

Every time when I run Discovery , multiple records of the same server appear in cmdb_ci_computer.
How to trouble shoot?

[Ravi Gaurav · Accepted solution]

Hi @SandeepKSingh ,

Possible Root Causes & Solution:

1. Identification Rule mismatch:
   The class’s Identification Rule doesn’t include a unique attribute like serial_number or bios_uuid.
   Fix: Go to CI Class Manager → Identification Rule → add strong identifiers (serial_number, uuid, fqdn).

2. MID Server or IP changes:
   The server’s IP changes and Discovery uses IP for identification.
   Fix: Adjust Identification Rule to exclude IP as an identifier if DHCP is used.

3. Discovery Pattern mismatch:
   Multiple patterns insert the same CI type (e.g., Linux and Unix patterns both run).
   Fix: Merge or prioritize patterns correctly in Discovery Pattern Editor.

[Dr Atul G- LNG · Accepted solution]

Hii @SandeepKSingh 

https://www.servicenow.com/community/itsm-forum/duplication-of-ci-s/td-p/714027

Duplicate server records in the CMDB occur because the Identification and Reconciliation Engine (IRE) creates a new CI instead of updating an existing one, often due to incorrect or missing CI identifiers or domain separation issues. To resolve this, verify the server's identification rules in the CI Class Manager, check for duplicate or missing serial numbers, and ensure proper MID Server configuration, especially if using domain separation. 

[Ravi Gaurav · Accepted solution]

Hi @SandeepKSingh ,

Possible Root Causes & Solution:

1. Identification Rule mismatch:
   The class’s Identification Rule doesn’t include a unique attribute like serial_number or bios_uuid.
   Fix: Go to CI Class Manager → Identification Rule → add strong identifiers (serial_number, uuid, fqdn).

2. MID Server or IP changes:
   The server’s IP changes and Discovery uses IP for identification.
   Fix: Adjust Identification Rule to exclude IP as an identifier if DHCP is used.

3. Discovery Pattern mismatch:
   Multiple patterns insert the same CI type (e.g., Linux and Unix patterns both run).
   Fix: Merge or prioritize patterns correctly in Discovery Pattern Editor.

[Ravi Gaurav · Accepted solution]

Hi @SandeepKSingh 

Below Link will Help you to understand in a better fashion
https://www.servicenow.com/community/itsm-forum/duplication-of-ci-s/td-p/714027

[Dr Atul G- LNG · Accepted solution]

Hii @SandeepKSingh 

https://www.servicenow.com/community/itsm-forum/duplication-of-ci-s/td-p/714027

Duplicate server records in the CMDB occur because the Identification and Reconciliation Engine (IRE) creates a new CI instead of updating an existing one, often due to incorrect or missing CI identifiers or domain separation issues. To resolve this, verify the server's identification rules in the CI Class Manager, check for duplicate or missing serial numbers, and ensure proper MID Server configuration, especially if using domain separation. 

[SandeepKSingh]

Thanks for Quick Response @Ravi Gaurav  and @Dr Atul G- LNG