How to choose storage for video surveillance?

Question

NAS

Hello!
Tell me how to deal with the storage of camera recordings with video.
We are expanding the park of IP cameras now 15 pieces, there will be about 20.
There are both 1080pi and 720pi. Currently 8 frames per second.
All this is stored on a software raid under windows, and the monitoring server is also on it.
Everything in principle is good, the recording is enough for 25 days.
And I want 2 times more + with a larger number of frames + with a larger number of cameras.
How to properly implement storage? I so understand it is necessary to buy NAS.
But how to connect it correctly? How is the network drive? Or there are some special technologies)
The volume will be approximately 8-10TB
Thank you who will respond!

Answer 1

For your recording volume, buying network storage is not very relevant. If you continue to record at 8 fps, the approximate recording capacity per camera should be 0.167 MB/s. This means that two months of recording fit into
3600 * 0.167 * 24 * 60 * 20 = 17,280,000 MB, which fits into an array of at least 17 TB.
If you do not use RAID, then you are satisfied with 3 disks of 6 TB. With six disks you fit into RAID1, which is very much in excess, four disks will be the best solution, you can use RAID5 or use nothing.
Thus, it is most reasonable for you to buy an NVR (network video recorder) supporting 24..32 cameras and 4 hard disks. For example DS-7732NI-K4, NVR5432-4KS2. Or it would be a good idea to use the ISS SecurOS Lite video surveillance software, modifying or replacing your computer accordingly to meet its requirements (all software and information about it can be downloaded for free from the supplier's website, in the first search engine results) For four drives, it is not necessary to use a discrete RAID controller , it is better to purchase a high-quality motherboard with a good Intel controller, for example, any Gigabyte of the Ultra Durable family. Intel Rapid Storage should, however, be disabled.
Network storage for small systems is not the best practice, since inexpensive storages (comparable in price to a registrar are practically household ones) are guilty of failures and low access speed. High-speed storage from large developers is disgustingly expensive for voracious video surveillance systems.
Regarding the use of RAID, there is also a peculiarity - your disks will last longer without it. But if you are recording something really important, the best practice would be to use RAID6 or 1, because without it, the last used disk will be most likely to fail, which means the last day's recordings will be lost, and someone will be able to take advantage of this.
If for some reason you want to use 24 fps, then the recording volume will be approx. 50 TB, but in this case it is better to use a computer, but with a basket, and can be a discrete RAID controller, or an NVR that supports 8 disks. NVR in this situation greatly wins in continuity.