Disk Space Management (Important)

The Storage Server monitors the disk space and responds according to the amount of available space.

Action When the Low Remaining Disk Space Notification Level is Reached

The Storage Server issues an event when the disk space available for recording (i.e. available space relative to the maximum disk space used) goes below a certain level. If [Maximum Disk Space Used] is not set, the drive capacity of the disk that stores the recording file is considered to be the maximum disk space

Important

An event e-mail notification is sent when the priority level of [Low Disk Space Warning] in the [Events] tab of the [Storage Server Group Settings] dialog box meets or exceeds the level specified in the e-mail notification settings.

Note

On receiving an event e-mail notification, an administrator can act promptly (for example, by removing unnecessary recording schedules) before a problem occurs due to low disk space

Low Remaining Disk Space Notification Level Conditions and Calculation Method

If one of the following conditions is met, a low remaining disk space notification level is indicated.

Condition 1: If the Storage Server disk space usage exceeds the following values:

M x (100 - A)/100

(M: Value specified in [Maximum Disk Space Used], A: Value specified in [Low Disk Space Warning Level])

For example, if the value for [Maximum Disk Space Used] is 100 GB and the value for [Low Disk Space Warning Level] is 10%, the Storage Server reaches the low remaining disk space notification level when the Storage Server disk space usage becomes 90 GB or more.

Condition 2: If the free disk space falls below the following values:

Disk space x A/100

(A: Value specified in [Low Disk Space Warning Level])

For example, if the disk space is 80 GB and the value for [Low Disk Space Warning Level] is 10%, the Storage Server reaches the low remaining disk space notification level when the remaining free disk space becomes 8 GB or less.

Note

If other applications use the same hard disk, you need to consider condition 2. Even if the Storage Server uses a small amount of disk space, it may reach the low remaining disk space notification level according to condition 2 because other applications have consumed a portion of the disk space.

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.

• 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.

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

• 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