On-Net Surveillance Systems, Inc.
NetDVMS 6.5f User Manual
Input, Events & Output
67
In short: When estimating storage capacity required for archiving, consider your organization's needs,
then plan for worst case rather than best case scenarios.
Automatic Response if Running Out of Disk Space
With archiving, NetDVMS can automatically respond to the threat of running out of disk space. Two
scenarios can occur, depending on whether the camera database drive is different from, or identical
to, the archiving drive:
Different Drives: Automatic Archiving if Database Drive
Runs Out of Disk Space
In case the NetDVMS server is running out of disk space, and
o
the archiving drive is different from the camera database drive, and
o
archiving has not taken place within the last hour, archiving will automatically begin in an
attempt to free up disk space. This will happen regardless of any archiving schedules, but will
of course only apply for cameras for which archiving has been enabled in the
Archive Setup
window
.
The server is considered to be running out of disk space if:
o
there is less than 10% disk space left, and the available disk space goes below 30 GB plus 1.5
GB per camera
- or -
o
the available disk space goes below 150 MB plus 20 MB per camera (example: with ten
cameras, the server would be running out of disk space if the remaining available disk space
went below 350 MB (150 MB plus 20 MB for each of the ten cameras))
The difference ensures that very large disks will not necessarily be considered to be running out of
disk space just because they have less than 10% disk space left.
On the archiving drive, NetDVMS automatically checks that the space required for data from a camera
to be archived plus 1 GB of free disk space per camera is available. If not, the archive drive's oldest
data from the camera in question will be deleted until there is sufficient free space for the new data to
be archived.
IMPORTANT: You will lose the archive data being deleted.
Same Drive: Automatic Moving or Deletion of Archives if
Running Out of Disk Space
In case the NetDVMS server is running out of disk space, and the archiving drive is identical to the
camera database drive, NetDVMS will automatically do the following in an attempt to free up disk
space:
1.
First, NetDVMS will attempt to move archives (moving archives is only possible if you use
dynamic archiving, with which you can archive to several different drives; configured through the
Archive Setup Window
). This will happen if:
o
there is less than 15% disk space left, and the available disk space goes below 40 GB plus 2
GB per camera
- or -
