Warm Reminder:

1. The above data are estimates and are for reference only!
2. Unit conversion: 1TB=1024GB, 1GB=1024MB, 1MB=1024KB, 1KB=1024Bytes, 1Byte=8bits, 1bit=0 or 1.
3. The above calculation results of the total required bandwidth only consider the transmission bandwidth of the main video stream. The actual configuration of network bandwidth also needs to consider the bandwidth occupied by simultaneously supported sub-streams. The actual total designed network bandwidth should be the bandwidth of the main stream and all concurrent sub-streams. Likewise, the total bitrate should be the sum of the main bitrate and all concurrent subbitrates.
4. The above calculation results of the total required storage capacity only consider the video file storage space. The actual number of hard disks to be configured also needs to consider the space occupied by other files such as pictures. If the disk array RAID mode is enabled, the actual available storage space after RAID must also be considered. Different RAID levels have different calculation methods for actual available storage space.
5. The full name of RAID is Redundant Array of Independent Disks. RAID is a technology that combines multiple independent physical hard disks into a logical hard disk group, aiming to provide higher storage performance and data backup capabilities than a single hard disk. RAID improves data reliability and system fault tolerance by dispersing data across multiple hard drives and combining error checking and data reconstruction technology. When a hard drive in the system fails, the RAID system can reconstruct the lost data through redundant data on other hard drives, thereby maintaining data integrity and availability.
6. RAID technology is divided into different levels according to different disk array combinations. Each level has its specific technology and application scenarios. Common RAID levels are: RAID 0, RAID 1, RAID 5, RAID 6, and RAID 10.
7. RAID 0: All hard drives are connected in parallel. The more hard drives there are, the faster the RAID 0 array access speed and the larger the total storage space. The hard drive utilization can reach up to about 100%, but RAID 0 has no data redundancy function. Damage to one hard disk will cause all data to be lost; RAID 0 is suitable for applications that require high-speed data transmission, such as video editing, audio processing, and scientific computing; the total storage capacity of RAID 0 is N * the capacity of the smallest hard disk, N is the number of hard drives , N>=2; the total storage capacity of RAID 0 in some systems is the sum of N disk capacities.
8. RAID 1: By creating mutual backup data copies on two independent hard drives, the reliability of the data is improved. When one hard drive fails, the system will automatically switch to the other hard drive so that the data can still be accessed. This eliminates the need for manual intervention or data reorganization, thereby improving system availability. RAID 1 is suitable for small application scenarios with high data reliability requirements, such as email systems and databases. RAID 1 only supports 2 hard disks. The maximum capacity is the capacity of the smallest hard disk. If there are more than 2 hard disks, the available space in the storage pool is only the capacity of 1 hard disk. If you want to mirror and expand the storage capacity, you must use RAID 10.
9. RAID 5: Spreads data across multiple hard drives through distributed parity, rather than simply copying data. Each hard drive stores a portion of the data and corresponding parity information. If a certain hard disk fails, other hard disks can reconstruct the lost data through parity information, thereby improving data security and reliability. RAID 5 is suitable for application scenarios that require high read and write performance and require redundancy to prevent data loss, such as video surveillance storage systems, financial systems, and databases. Overall, RAID 5 has relatively high capacity efficiency and relatively high cost performance among all arrays. Most mainstream RAID groups use RAID 5 arrays. The total storage capacity of RAID 5 is (N-1) * the capacity of the smallest hard drive, N is the number of hard drives, N>=3.
10. RAID 6: Improved on the basis of RAID 5, RAID 6 increases the data parity bit by one, so the number of hard drives allowed to be damaged is also increased from one in RAID 5 to two. Since the probability of two hard disks in the same array being damaged at the same time is very small, RAID 6 gains higher data security than RAID 5 at the cost of adding one hard disk, but its writing performance is relatively low. RAID 6 is suitable for applications that require a high degree of reliability and data security, such as financial systems and medical records. The total storage capacity of RAID 6 is (N-2) * the capacity of the smallest hard drive, N is the number of hard drives, N>=4.
11. RAID 10: Combine multiple hard drives into two or more RAID 1 arrays, and then use RAID 0 to combine them into a single virtual hard drive. It uses parity to implement stripe set mirroring, so it inherits the speed of RAID 0 and the security of RAID 1. Its read and write performance is better than RAID 5 and RAID 6, and it also has a data redundancy mechanism, a three-high array technology with high cost, high reliability, and high storage performance. RAID 10 is suitable for applications that require high performance and high reliability, such as databases and server virtualization. The total storage capacity of RAID 10 is (N/2) * the capacity of the smallest hard disk, N is the number of hard drives, N>=4, and the installed hard disk must be a multiple of 2.
12. It is recommended that the hard drives in the same RAID group be of the same brand and capacity, preferably the same model, to reduce the difference in hard drive read and write performance and maximize the utilization and performance of the hard drive.