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Cisco Bug: CSCuj85960 - 340B158:CDE460: Cant sustain 18.2Gbps recording/7.72Gbps static streams

Last Modified

Jun 21, 2020

Products (1)

  • Cisco Videoscape Distribution Suite for Television

Known Affected Releases


Description (partial)

After starting with a clean recorder, as you add more and more data to the file system, the write performance will slow down gradually as the disks fill up.  Once the disks are full, and we start archiving thing, the write performance will improve to a point mid way between the starting fast rate and the nearly full slower rate.

The file system writes to the faster parts of the disk first and then moves to the slower parts of the disk later.  So, as the disks fill up, the write throughput decreases as you approach the "full" point.  

Once the file system reaches the desired full point, recordings will be archived and their corresponding disk space will be freed.  Over time, the available disk space will be the sum of all the archived recordings, and because these will be randomly scattered across the system (some from slower parts of the disk and some from faster parts of the disk); so over time the write performance will approach that of a system that is half full.  This will be an improvement over that at the time the system was nearly full.
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