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    FTP backlog memory corruption

    Discussion About Products
    ftp buffer overflow sd slow sd corruption
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    • user_654306224615431_654306224615431
      rho last edited by

      I have a number of camera's set up to FTP files to a server and are also fitted with SD cards.
      I recently encountered problems with the SD card either being exceptionally slow to update (several minutes) or in two cases loose an entire days recordings. At first I thought this was an ageing problem of the SD cards but I eventually traced it to buffer overflow within the camera due to FTP backlog.

      I had the ftp postpone set to 30 seconds but discovered due to a temporary slowdown in the server (due to a slow SSD) the resulting file was taking a lot longer than 30 seconds to transfer so if there were frequent alarms the camera would build up a backlog and eventually become corrupt.

      The very slow SD writing manifests itself when an alert is received it is found the corresponding SD recording is very short (typically showing 40secs or less and corrupt in that replay fails, however several minutes later when the ftp transfers are complete the recording is suddenly updated to it's true length (several minutes) and playback becomes possible.

      So it seems Reolink have a classic buffer management problem and SD recordings are not closed/completed till the ftp transfers are complete!

      I have for the time being increased ftp postpone to 1 minute that alleviates the problem. I hope the problem goes away once I increase the speed of the ftp server but I hope my description helps others with mystery disappearing recordings and slow SD problems, if in doubt switch of ftp!

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        • joseph_1979
          Joseph Global Moderator @rho last edited by

          @user_654306224615431_654306224615431 Thanks for reporting this. Actually recording on to SD and ftping are two independent processes. Both have different transfer sessions and buffers.

          I suggest you to submit an email to support explaining your case.

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          • user_654306224615431_654306224615431
            rho @Joseph last edited by

            @joseph_1979 Thank you for your reply, this sheds a little more light on the problem. Fortunately I have not experienced it again and the server is now running at 6MB/s sustained so perhaps it will just work from now. If it does happen again I will be sure to contact support, I posted here to see if any other users had experienced anything similar.

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