Large SAP Idocs

Thanks Mahesh/Abhir/MR/Holger,

I am about to request to my infrastructure team all SAP fix,version, Jar and lib file going to used for this implementation but still my client/support team like to know about about

Q 2 and Q 5 ie

  1. Once sap idocs is triggered from sap system, How ESB server/middleware or How do you determine incoming idoc file is large files?

  2. If any transient or network breakdown happen in Integration flow then how/where do you store incoming large file for time being? or what is logic or system you use to store this large file so that it should not be lost in flow.
    Basically, my client intention is like to know idea here is to resubmit failed data again will cost more to them.

Kindly suggest