question Re: Discovery updating and creating new record in ITOM forum

Discovery updating and creating new record

yash755 — Thu, 13 Sep 2018 09:12:02 GMT

Hello all,

I have a query regarding identifier rules. Suppose I have two identifier rules.
Rule 1: It checks the uniqueness of the serial number
Rule 2: It checks the uniqueness of the name

Now, suppose a discovery run and brings some CIs.
So, CI will first look for rule 1.
So what will happen if the serial number is the same and what will happen if it's different?

When will it go to rule 2?

When will be the same record updated and when will the new record create?

Re: Discovery updating and creating new record

johnnyjava — Thu, 13 Sep 2018 09:32:32 GMT

It should look at the second entry (1 rule, multiple entries) when / if the fields (criterion attributes) for the 1st entry aren't present. So name will be considered when the serial_number is missing. (I see this happen for network devices on very busy network segments where the SNMP traffic is sometimes dropped. You can tune the SNMP disco settings to have it wait longer or repeat attempts.)

As long as the Identification and Reconciliation Engine can locate a record that matches by one of the entries for that class of device / application server, then it will update the existing record. If there is no match, but there are matchable attributes then a new record will be created.

If there's more than 1 matching record, it should mark the newest of them as a Discovery source = Duplicate.

Re: Discovery updating and creating new record

richardbrounste — Thu, 13 Sep 2018 09:35:42 GMT

And if the serial number is the same, it will overwrite the CI. If there are 2 or more CIs with the same serial number, it will mark them as duplicates. Check out this article on how we use the identification rules to find duplicates: https://community.servicenow.com/community?id=community_blog&sys_id=3efc66a5dbd0dbc01dcaf3231f96193b

Re: Discovery updating and creating new record

yash755 — Thu, 13 Sep 2018 09:38:19 GMT

So when will it go to Rule 2?

Re: Discovery updating and creating new record

richardbrounste — Thu, 13 Sep 2018 09:40:35 GMT

If the serial number is empty, just as johnnyjava said.

Re: Discovery updating and creating new record

yash755 — Thu, 13 Sep 2018 09:46:05 GMT