Dahua NVR21-8P-S2 SERIES, Руководство пользователя

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User's Manual
Appendix 2 HDD Capacity Calculation
Calculate total capacity needed by each device according to video recording (video recording type
and video file storage time).
1. According to Formula (1) to calculate storage capacity q; that is the capacity of each channel
needed for each hour, unit Mbyte.
qi
=
d i
+
8 x 3600
+
1024
( 1)
In the formula:
d,
means the bit rate, unit Kbit/s
2. After video time requirement is confirmed, according to Formula (2) to calculate the storage
capacity m,, which is storage of each channel needed unit Mbyte.
(2)
In the formula:
hi means the recording time for each day (hour)
Di means number of days for which the video shall be kept
3. According to Formula (3) to calculate total capacity (accumulation) qr that is needed for all
channels in the device during
scheduled video recording.
In the formula:
C
means total number of channels in one device
(3)
4. According to Formula (4) to calculate total capacity (accumulation) qr that is needed for all
channels in device during
alarm video recording (including motion detection).
q
T
=
Z : m
i
xa%
i=l
In the formula: a% means alarm occurrence rate
398
(4)