TECHNOLOGY APPLICATION GUIDE

Storage for Video Surveillance

What is it?

Storage is the retention of the data collected by the optical sensors (cameras) in either a file or block format. Storage architecture is the organization and management by video management software (VMS) for later retrieval and analysis. The data retention format used will usually follow an industry standard such as MJPEG, H.264, H.265 or some other recognized codec.

The type of storage needed for video surveillance systems is dependent upon the architecture of the customer’s network and storage requirements.

Types of Storage Architectures

DAS

Direct Attached Storage: Server and storage is in the same physical appliance. This storage device is typically provided by VMS companies in the form of an appliance that also runs the software application.

DAS (Direct Attached Storage) diagram

NAS

Network Attached Storage: Physical appliance is separate from the server.

  • RAID
    Redundant Array of Independent Disks:
    This is only applicable to DAS and NAS architectures and gives the ability to create redundancy as equipment fails over time to mitigate the loss of information.
  • Edge
    Video is recorded to an SD card that fits into the camera. It is typically used in conjunction with another storage architecture as a means of redundancy.
NAS (Network Attached Storage) diagram

SAN

Storage Area Network: The VMS client deciphers the data and stores the information in larger blocks, which requires the client workstation to have more processing power. It uses protocols to allow general sorting of the data such as Fibre Channel, iSCSI, ATA over Ethernet and HyperSCSI.

SAN (Storage Area Network) diagram

Cloud

Video is uploaded over the network to a server and storage architecture owned by a host. It reduces the amount of hardware at the customer’s site and is paid for on a monthly basis.

Cloud diagram

Storage System Technologies

Series of packets are stored in either file- or block-based formats. The video management software used in the application defines which format will be used.

File

A series of packets is defined by the video management software and includes a header and footer, which makes it more efficient for the server and processor.

Block

Reduces the amount of space needed to store data.

Types of Drives

Drives are the spinning disks that reside within the storage appliances. The primary factor in choosing one over the other is the speed of the system.

Type

Description

Pros

Cons

Common Applications

SATA (Serial ATA)

Communicates in half-duplex

Typically spins at 7,500 rpm

Cost-effective

Can only send or receive information at one time

Long-term storage

Video data moved from SAS drives to SATA drives

SAS (Serial Attached SCSI)

Communicates in full-duplex

Typically spins at 15,000 rpm

Sends and receives information at the same time

Faster delivery of the information to the viewing client

More expensive than SATA drives

First 24 hours of recorded video

Solid State

Contains no moving parts

Highly durable

Ideal for harsh environments

Costly

Limited storage capacity

Extreme weather conditions

Mobile applications

Why is it important?

Implementing a storage architecture designed to meet a system’s specific requirements provides the following:

  • Accessibility: Recall both recent and older video without delay.
  • Reliability: Redundancy to mitigate the risk of losing critical video evidence.
  • Scalability: Flexibility to add more devices to systems as camera prices decrease.
  • Cost management: Know what is needed now and budget to grow with the system.

Standards

SATA-IO – INCITS T13 subcommittee ATA, the INCITS T10 subcommittee (SCSI), a subgroup of T10 responsible for Serial Attached SCSI (SAS)

INCITS – The T10 technical committee of the International Committee for Information Technology Standards (INCITS) develops and maintains the SAS protocol

SCSITA – The SCSI Trade Association (SCSITA) promotes the SAS technology

Featured Products

Surveillance Cameras
Video Servers and Storage
Switches
Video Management Software
Contact Anixter

Is your storage architecture designed to handle increasing capacity and processing demands for higher resolution and growing systems? Contact an Anixter security expert or your local Anixter sales rep to determine the right solution for your needs.




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