Security Business

MAR 2014

Find news and information for the executive corporate security director, CSO, facility manager and assets protection manager on issues of policy, products, incidents, risk management, threat assessments and preparedness.

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62 www.SecurityInfoWatch.com | SD&I | March 2014 robust command queuing, and superior error detec- tion and correction. Dual port is important because it provides two redundant paths to every hard drive for increased availability and reliability in case of a sin- gle-path failure. The importance of using 6G SAS drive technology in IP-based physi- cal security solutions cannot be understated. The high I/O workload of network cam- eras can constantly inun- date servers, as client work- stations on the other end simultaneously attempt to pull video for review. Both slower speed and SATA drives can cause sig- nificant bandwidth issues directly due to the buffering that is required with single- channel data transfer. This lag can result in dropped or frozen frames, video arti- facting — which is distor- tions and other visual inconsistencies result- ing from compressing a video feed — and a number of other issues. Mission-critical IP video applications require much greater protection than typical off-the-shelf IT data servers, regardless of size and scope. The Case for Purpose-Built Storage Storage of your video in a typical network video solution can be immense. It could entail potentially hundreds of high-resolu- tion cameras capturing as many as 30 frames per second, operating 24/7 for a month or up to a few years. The most common mistake made is to look at streaming video as just another form of data. The case for purpose-built video storage over traditional data solutions focus- es on five key areas: 1.Massive database size needs; 2.I/O-intensive operations; 3.Intolerances of system latencies; 4.Constant bit-rate streaming; and 5.Demanding operat- ing environments, such as temperature, vibration, bit-error rate and more. Because of the intrinsic nature of stream- ing video, each of these five areas requires a purpose-built approach that takes into account unique needs, capabilities and sys- tem demands. Here are four storage technologies that can be used for IP video retention: Internal Storage is the most popular and offers the best performance at the best price point. The technology records the video to the internal drives within the server. The drives are protected by RAID 5 or 6, ensur- ing that if a drive was to fail, no data would be lost. Today's scalable servers can house up to 240TB, all internal to the server. Directed Attached Storage (DAS) is used when there is not enough drive space avail- able within the server chassis. Because of its multi-lane SAS connection to the server, DAS performs almost identically to internal stor- age — the drives are also protected by RAID 5 or 6. Direct Attached Storage can be scaled up to 1120TB from a single server using just 22 rack spaces. Centralized Storage (iSCSI) is used when your customer wants to store the video in a central location. It allows for multiple serv- ers to send video data across the network to a centralized storage array. While popular in the IT world, this storage technology is not as effective in the video world. The iSCSI storage device is only as fast as the network to which it is attached, regardless of what kind or how many SATA or 6G SAS drives are installed. The storage array design must take into consideration potentially large VIDEO SURVEILLANCE Edge storage houses the audio and video recordings within a camera, typically on an SD card. Purpose-built work- stations for video feature higher level cooling systems, 450 watt and greater power supplies, dual Ethernet adapters (for management), server-grade proces- sors and expanded display capabilities. SDI_60-63_0314 Video Burgess.indd 62 3/6/14 11:03 AM

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