Some of the HDD manufacturers have bulk storage HDDs that have firmware optimized to handle multiple video streams(WD Purples being one if memory serves) but I haven't seen them deliver on those promises for modern cameras, and higher write endurance commodity SSDs are available at the ~250$/2tb point these days. Also IP cam firmware is cancer, so having the cams and the non-management interface of the NVR on it's own vlan at least should be a must.
We used iscsi right from the VM the NVR runs in to park stuff on our main storage array, but you need to be careful not to get into trouble with write amplification so a dedicated box with local storage is not a bad thing. 99.9(probably more nines)% of video footage never gets looked at, and the main windows for requests for lookups are today, yesterday, and" what happened while I was on vacation" If you need longer retention consider exporting to nearline and then (Shudder) tape, or expiring that to something like glacer.
You will spend hours pouring over footage to find that the footage is useless or didn't record. And months of low quality/framerate footage is probably useless garbage that will also waste tons of your time if there is an incident. If this is for a DOD site or a casino it may be a different story, but from a usability standpoint it's more important to be able to pull about 3 weeks of high frame rate, clear footage from all of your cameras than to have every second of footage on bullet proof storage if you can't record good footage in real time. If you are going 5 plate 3.5 sas drives then the difference in space probably isn't the issue (raid vs mirrors) but with spinning drives more spindles = more cameras. I can't see RAID 6 being ideal for most places, the hit to both write and read performance is huge vs either mirrors or mirrored stripes. These days I would probably slab in 2.5 in WD red SSDs but spinning drives will work fine if they are provisioned optimally. This is a problem where the hardware really can make a difference, and generic nearline 5400 or 7200 drives may not do well. Ask an integrator or a vendor for a quote and you get a 15k box where each camera is set to 5-10fps and record on motion. Ip cameras/NVRs are one of those "*special*" industries that seem unable to recommend specs that result in a working system. TLDR, probably ignore this unless you are wrenching on the storage part of the problem :)
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