Owner's Manual

Disk Space Management (Important)
113
Operation and Management
7
 Action When the Threshold Level is Reached
Recording continues, however, the Storage Server starts
deleting recording files, beginning with old files, and
issues an event.
Note
• Recording files are deleted, even if they have not reached the
[Maximum Storage Period]. However, if the oldest file is
currently in use by the Viewer (for example, for playback of
recorded video), it will not be deleted and the next oldest file
will be deleted instead. Deletion continues sequentially until
the free disk space meets or exceeds the threshold again. For
details on saving files, see Chapter 8.
• Normally, a recording file for which the minimum storage
period has not elapsed is excluded from deletion. Note that
such files are also deleted if the free disk space cannot meet
and exceed the threshold value by deleting all the other files.
Threshold Level Conditions and Calculation Method
The threshold level is considered reached when the
amount of free disk space drops below the following level.
(Number of cameras + 1) x 64 MB
 Action When the Limit Level is Reached
The Storage Server stops recording and issues an event
when the free disk space drops to this level.
The Storage Server resumes recording and issues an
event when the free disk space increases above this level
after deleting recording files.
Limit Level Conditions and Calculation Method
The limit level is considered reached when the amount of
free disk space drops below 64 MB. This value is fixed.
Threshold
level
Delete
oldest first
Notification
Deleting files on <Drive
Letter> drive due to low
free disk space: Started
Important
• The threshold level is to protect against reaching the limit
level. We recommend that you take appropriate measures,
such as deleting unnecessary recording data, when the
event for the low remaining disk space notification level
occurs.
• Storing recordings that cause the threshold level to be
exceeded increases the load on the Storage Server and may
cause recording to be interrupted, resulting in incomplete
recordings. We strongly recommend that you operate the
Storage Server at below the threshold level.
• If e-mail notification is specified, an e-mail message is sent
for the event that occurs at each level (p. 46).
• Note that the threshold level conditions may be met before
the low remaining disk space notification level conditions are
satisfied, depending on the circumstances. For example, a
large number of cameras with limited disk capacity may
cause a value for (Numbers of cameras +1) x 64 MB to be
larger than the value of disk capacity x low free disk space
notification setting/100.
Deleting files on <Drive
Letter> drive due to low
free disk space: Started
Recording
stopped
notification
Delete
oldest first
Notification
Limit level