| Hardware |
| System Architecture |
Asymmetric distributed architecture |
| Number of nodes |
2 to 160 |
| Form Factor |
4U rack server |
| Processor |
Inter IvyBridge 4 cores |
| Data Disk Type |
2.5-inch/3.5-inch SATA and SAS enterprise HDD
1TB/2TB/3TB/4TB/6TB |
| Number of Disks |
24 |
| Storage Network type |
4 x 1 GE, load balancing |
| Other interfaces |
1 x USB3.0, 1 x eSATA, 2 x SAS, 1 x RS232, 1 x RS485, 1 x 1GE management interface |
| System Architecture |
| Cluster Architecture |
Distributed objective storage architecture |
| Distributed Storage |
Erasure coding technology, data is segmented and saved in multiple storage nodes |
| Data Protection Level |
Dynamic N+M mode: 1+1, 4+1, 8+2, 12+3, 16+4, data is still usable after M storage nodes fail |
| File System |
| File System |
Dahua EFS distributed file system |
| Data Type |
Video, image and document |
| File-level Access |
Global namespace, fIle can be accessed by 3rd party application directly |
| Load Balancing |
Load balancing based on capacity and performance of each node |
| Data Recovery |
Valid data recovery instead of entire disk recovery |
| Scalability |
| Storage Expansion |
Scale-out technology, online expansion, with less than 60 seconds for expansion of a single node |
| Quota Management |
Data quota management based on users, user groups and directories, allocation of capacity on demand |
| Performance Index |
| Read/write Performance |
Sequence read/write: 4 GB/s |
| 80% read, 20% write: 3.5GB/s |
| 20% read, 80% write: 3.5GB/s |
| 50% read, 50% write: 4GB/s |
| Data Recovery Speed |
2 TB/h |
| Stream Processing Performance |
Number of video channel: 2000/node |
| Storage bandwidth: 700Mbps/node |
| Fowarding bandwidth: 700Mbps/node |
