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Preparation for Backup
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About Backup Device
Prepare necessary equipment for backup depending on the data quantity of the VK-64/VK-
16. Basically, you should use the DDS-4 type device if a single backup copies several
Gigabytes through 40 GB of data, and DAT72 or AIT if it copies around 70 GB of data.
Further, if backup data quantity reaches 100 through 400 GB, you should use the LTO
device. If you need more capacity or want to omit media replacement, you can consider
auto loaders for the LTO device.
Backup Example for VK-64/VK-16
If 10 Camera Servers record video for 30 days at 1 fps (10 KB)
the required data capacity is 300 GB per month, 70 GB per week, and 10 GB per day.
In this case, it is recommended to use the LTO device (Ultrium tape device). This type
of device records 100 through several hundreds GB of data at the average transfer
speed of 25 through 30 MB/sec (or 40 through 60 MB/sec when data is compressed).
The time required for making backup of data for 30 days (300GB) is approximately
12,000 seconds (i.e., 3.5 hours). The time is shortened to approximately 2.5 hours
when data is compressed (Although the hardware specifications mention that the
transfer speed will be doubled by compressing data, the expected compression ratio
depends on data formats. Therefore, it is dangerous to think so).
The time required for making backup of data for a week (70GB) is approximately 2,800
seconds (i.e., a little longer than 46 minutes).
The time required for making backup of data for one day (10GB) is approximately 400
seconds (i.e., 6 minutes 40 seconds).
Notes: Recording does not stop while making a backup of data; however, the recording
frame rate may be reduced from the specified value due to disk I/O load and
CPU load.
About Backup Tool
It is recommended to use a third-party backup tool for Windows. Read the manual of the
tool for deployment.
About Restore Server for Archiving
If the purpose of backup is archive, you must prepare a separate PC for the Storage
Server to which data will be restored. This PC must have the same drive configuration
(e.g., hard disk configuration). For example, if the source server’s system drive is C and
data storage drive is D, and video data drive is E, you must configure the PC with the
same drive configuration. However, the hard disk capacity must be determined according
to data to restore.
Video data for VK-64/VK-16 is non-reversible compressed data.
Compression process done by tape or other devices is not
necessary.
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