Documentation for Axxon One 2.0. Documentation for other versions of Axxon One is available too.

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General information about the file system

Fragmented files accumulate over time in the Windows file system. This is due to the fact that the operating system sequentially fills the free disk space when writing files. 

Free disk space, which appears when old files are deleted, can be located in different parts of the disk; therefore, each file can be split into many fragments. When reading or writing such a file, the hard drive head must constantly move, which reduces the read/write speed and causes mechanical wear of the disk.

AxxonSoft has developed its own SolidStore file system specifically for storing archives. The system is installed on a blank physical or logical disk, which is fully allocated to Axxon One archive (see Creating archives). When developing SolidStore, it was taken into account that recording takes place in one direction (in a loop), and the newest data is written in place of the oldest data. 

Attention!

Loop recording (FIFO overwriting) generally deletes the earliest recordings, but in some cases selected recordings within 10% of the oldest ones can be deleted. This feature protects archive volumes from fragmentation. In such cases, these can be gaps near the beginning of the archive when viewing the recordings.

Features of SolidStore file system

By optimizing the reading/writing process, we managed to minimize the movement of the hard disk head and to achieve three important advantages:

  • achieve high read/write speeds, approaching the physical access speed limit of the hard disk;
  • increase the service life of the hard disk;
  • solve the problem of data fragmentation: as data is written only in a loop, fragmentation is minimal and doesn't accumulate with time. This ensures that the read/write speed remains high throughout the operation of the video surveillance system.

SolidStore relieves the user from the need to periodically stop the video surveillance system and run the Disk Defragmenter tool. This significantly increases video surveillance uptime, and the protected facility remains protected at all times.

If it is not possible to allocate a separate disk for Axxon One archive, this archive can be written as a regular file in the existing Windows OS file system.

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