Sizing of catalog using an external 7 terabyte RAID

I have just purchased LR in order to see if it can efficentaly catalog my 100k of raw photographs (19 meg each).These reside on a 7tb network drive.  Since LR does not allow me to place the catalog on a large external network drive. I want to know how large it will get.
I would also like to hear from anyone who has done something similar and their best practices before I commit the time and effort to process 100k+ of photos....I want to know if this is a good digital photo asset management system for collections of this size...or not.
Thanks to all
Bob

Rick,
Thanks for your help. Perhaps you can point me in the right direction on another issue.
I selected all the directorys to import in a massive selection and let LR run overnight. It got most of them except five (each one has 4k photos) LR shows them as 0 files. So I tried importing them indivdually. A long process ensued but at the end LR said no files imported.
So I tried syncing them (remember I'm new to LR) it was a two step process that first counted up the files(so I know LR sees them) then asked me to press sync. Another long process but no luck same result. I am at a loss. Did I miss something? Thanks again.
Bob

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