Performance Archive Utility Estimation

Issue

Performance  Archive Utility Estimation

Product Line

Pelco Video Management

Environment

  • DS
  • Digital Sentry
  • Archive UtIlity software

Cause

Estimating Digital Sentry Archive utility Bandwidth. 

Resolution

Performance Estimating
Archive Utility has been designed and tested to provide an archiving solution for a single approved DVMS as well as multiple Integral DVMS units. Generally, single archive jobs created with Archive Utility Administration application should not contain more then one DVMS. It is recommended that users create several archive jobs to handle the archiving of multiple DVMS units.

The user must consider several restrictions before configuring Archive Utility:

  • First, the total frame rate of all archive jobs must not exceed 720 fps for two or more archive jobs. To measure the total frame rate of all the archive jobs, determine how many cameras were added into each
    archive, and then connect to the source DVMS and determine the frame rate configured for each camera. Add all the frame rates for all cameras in each archive to determine the total archive frame rate. This
    number should not exceed 720 fps when archiving in real time with two or more concurrent archive jobs.(Real-time archiving refers to archiving all configuration-dependent data from the source DVMS without
    falling behind.)
  • Second, the total frame rate for a single archive job must not exceed 480 fps. This number is determined in the same way as for multiple DVMS units.

To estimate the possible system configuration while considering the performance guidelines, use Integral Bandwidth Calculator. This utility determines the optimal camera configurations for several DVMS units that will not exceed the maximum recommended client network bandwidth. The maximum recommended client network bandwidth is about 6 MB/sec for a single DVMS archive and 10 MB/sec for two or more DVMS archives.

Consider the following example archive configuration using Integral Bandwidth Calculator:

  • Digital Sentry Bandwidth Calculator allows multiple camera group settings to simulate different DVMS units.Determine how many DVMS units must be archived concurrently. Suppose you want to archive data from
    four DVMS units, and each DVMS is running DigitalSENTRY 7.5.x.x with ENC5416-NTSC camera types, 5 fps per camera, and a total of six cameras. After configuring the Camera Settings, look at the
    Remote Client Settings. In this case, the only client connected to the DVMS is Archive Utility. The green arrow indicates the number of cameras viewed by each remote user field. For the Integral Archive
    Utility client, that field must contain the total number of cameras selected in the Camera Settings. So, you have the four DVMS units, each with four cameras, for a total of 16 cameras. The rest of the Remote
    Client Settings fields must be kept at default settings.

After configuring the Integral Bandwidth Calculator, look at the Bandwidth Usage Estimation. As stated previously, to guarantee real-time archive performance, the bandwidth (indicated by the blue arrow) cannot
exceed about 10 MB/sec.

  • If the Client Bandwidth shown by the DS Bandwidth Calculator exceeds the maximum bandwidth for real-time archiving, the Archive Utility most likely will fall behind the DVMS that is recording the
    data and will never catch up. This situation is acceptable if the user wants to create a “snapshot” of data during some predetermined time period; in this case, the user should configure a one-time archive and
    specify the start and end date of the archive.
     
  • In the current archive release, a maximum of 64 cameras can be archived from all archive jobs on the Archive Server. If the 64-camera limit is reached, there is no guarantee that the archive will avoid network
    or other errors. The Archive Server can recover from spurious errors by attempting to re-archive of the failed periods. However, with more than 64 cameras, the complete data integrity cannot be guaranteed.

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