Canon C50FSi Network Video Recorder VK-64/VK-16 Administrator's Manual - Page 224

Preparation 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). Note 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. Tip Video data for VK-64/VK-16 is irreversible compressed data. Compression process done by tape or other devices is not necessary. Backup Tool It is recommended to use a third-party backup tool for Windows. Read the manual of the tool for deployment. Restore Server for Archiving If the purpose of backup is archive, you should 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. 7-4