What is the cavader agreement file - agreement.cdv?
In the go source I can see that there is an option to disable it. Can I safely do so in an archival node if I want an indexer to be able to run of it?
Yes, it wouldnt be a bad thing to disable it. It used for debugging the agreement protocol, which I don’t believe you’re working on. 
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Nice one, thank you. I disabled it and it seems to have freed up some disk I/O resulting in somewhat increased blocks synced per minute