What are the differences of an sap sid and host name?
SID is nothing but a name for an Instance.
Host is the system which hosts the Instance.
Hope you will get an idea with the following example
Local Installation: Here we have both Database Instance[DB SID] and the Central Instance [SAP SID] in same system. i.e Hostname is same..
Domain Installation: Here we have different hosts to hosts Database instance & Central instance. i.e. 2 hosts.
Host is the system which hosts the Instance.
Hope you will get an idea with the following example
Local Installation: Here we have both Database Instance[DB SID] and the Central Instance [SAP SID] in same system. i.e Hostname is same..
Domain Installation: Here we have different hosts to hosts Database instance & Central instance. i.e. 2 hosts.