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1. The device must have no less IOPS the Axxon One VMS.
   The Axxon One VMS records video footage to archive volumes in 4MB blocks with a 10 second interval. If the most recent block is not full after 10 seconds, it will be filled up later.
   Similarly, footage is played back in blocks (except for re-indexation, see the utility for archive management Console utility for working with archives).
   This is how you can estimate the IOPS value for the Axxon One VMS.

   	If average bitrate per camera is less than 3.6 Mbps	If average bitrate per camera exceeds 3.6 Mbps
   IOPS during archive recording Archive recording includes both data input (writing) and output (reading) operations	IOPS (writing) = 0,29 * N IOPS (reading) = 0,035 * M	IOPS (writing) = 0,065 * M IOPS (reading) = 0,035 * M
   IOPS during archive playback  Archive playback includes only output (reading) operations	IOPS (reading) = 0,035 * R * S
   IOPS during simultaneous recording and playback	IOPS (writing) = 0,29 * N IOPS (reading) = 0,035 * M + 0,035 * R * S	IOPS (writing) = 0,065 * M IOPS (reading) = 0,035 * M + 0,035 * R * S
   where N is the number of camera channels being recorded; M is the cumulative bitrate over all camera channels being recorded, in Mbps; R is the cumulative bitrate over all camera channels being played back at normal speed (1x), in Mbps; S is the playback speed.

   
   

2. If you use RAID storage, please specify write-back policy for writing to cash memory.

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