VMS Storage Best Practice? VMS Server With Storage Or Dedicated Storage Device?

I am working to develop a new customer in our neighborhood the primary site has around 325+ cameras with 1/3 on older ONSSI and 2/3's on a Vicon platform the upper end of cameras including remote office sites is 500+ channels some streamed back to the head end some stored locally . We are leading our story with ONSSI Occularis v5 since the initial lead started from ONSSI. My original proposal was built with the owner providing virtual servers to host the VMS while storage would be handled in a dedicated storage product from Spectra Logic our calculations pointed toward 180+TB to hit the requirements. The owners IT folks have now come back and asked me to revise my proposal to supply a dedicated VMS server.

I am wrestling with which storage approach would be the best option now scale up the dedicated VMS server chassis to include storage, or stay with the dedicated storage platform and spec out the VMS server to handle the work load and pass storage to the drive array.

Any feedback would be greatly appreciated.

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