Canon VB-M42 Network Video Recording Software RM Series Administrator s Manual - Page 115
Action When the Threshold Level is Reached, Threshold Level Conditions and Calculation Method
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Disk Space Management (Important) „ Action When the Threshold Level is Reached „ Action When the Limit Level is Reached Recording continues, however, the Storage Server starts deleting recording files, beginning with old files, and issues an event. Deleting files on drive due to low free disk space: Started 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. Deleting files on drive due to low free disk space: Started Threshold level Delete oldest first Notification Recording stopped Delete notification oldest first Notification 7 Operation and Management 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 Limit level 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. 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. 48). • 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. 115
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