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Each time the streams are added to the list (see Selecting the cameras), or the parameters affecting the calculation are changed (bit rate, streams recording, etc.), the parameters are recalculated.

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1. Number of servers—the number of servers recommended for the specified number of cameras.
2. Server platform—platform name and, if detection tools using the GPU /VPU are specified, links to GPU /VPU selection (see Types of detection tools). When you click on the link to the GPU /VPU selection, the documentation pages with the performance data will open.
3. Server CPU load—CPU load as a percentage.

4. Server RAM, GB—the recommended size and number of RAM modules for dual-channel operation, taking into account the number of processors on the platform. For example, “4 x 8GB” RAM means two 8GB RAM modules per processor for a dual-processor platform.
   

   Info
   title Note
   RAM should be used in dual-channel mode or greater mode based on the number of processors in the platform. For example, at least 2 RAM modules must be installed for single-processor platforms, and at least 4 RAM modules for dual-processor platforms. Using RAM at a higher frequency, or using RAM in dual-channel mode or greater mode results in CPU load decrease, and therefore in the performance increase.

   
   

5. Server storage configuration—required configuration of the disk subsystem, in particular:
   1. Actual archive size and required HDD marked capacity  for storing the archive if No RAID calculation was chosen, or actual archive size if RAID level was chosen.
   2. Recommended RAID configuration if RAID level was selected:
      1. total number of disks per server,
      2. disk size,
      3. number of RAID groups,

      4. number of hotspare-disks.
         

         Info
         title Example
         28x 4 TB (2x RAID-6 + 1x HS) means 2 RAID-6 groups with a total of 27 4 TB disks and 1 hotspare-disk.

         
         

   3. The SSD volume required to store metadata and system log.
6. Required storage recording rate—total recording rate which must be supported by the disk subsystem of the server.
   
7. LAN (in/out)—total rate of the video streams from IP cameras, to be provided by the bandwidth of the network interface of the server.

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If a GPU-based detector was selected for video analytics (see Types of detection tools (Video Analytics)), then recommended GPU models will be listed below the table with recommended platforms:

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For a server with detection tools that use GPU/VPU resourcesGPU resources, the suitable models and the number of GPUs/accelerators should be selected according to the information from the GPU performance for detection tools section.

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