Hi @LuanNguyen , yes, yupu can use an HF as intermediate Forwarder between UFs and IDXs. The number is relevant only to correctly have a dimensioning of the reference hardware. At first I hint to engage a Splunk Architect for this job. Then I hint to avoid a single point of failure using at least two or three HFs. Then there isn't a reference hardware for the HF, in my experience we started with the default HW reference (12 CPUs, 12 GB RAM, 300 GB disk), and then, analyzing the use of these resources, we defined to add some CPUs. In addition, you should define if these HFs are only concentrators or if they also do parsing, merging and typing phases, especially the parsing phase: many transformations requires more resources. Then, if you have many UFs, you could prefer to have three or four HFs instead of two with more resources, to avoid that the network interfaces are the bottleneck. As I said, this design requires at least a Splunk Architect or a Splunk PS. Ciao. Giuseppe
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