DAHUA CSS7124S-ERD 24-HDD Cloud Storage Node

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

8 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

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