Edge Recording, Servers, and Storage Management
Transcript of Edge Recording, Servers, and Storage Management
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Edge Recording, Servers, and
Storage Management Connecting Physical Security IP Networks
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> What are the requirements for acceptable
video quality?
> How long does the material need to be
archived?
> Does the organization already have a standard
storage solution/vendor?
> What are the consequences if stored video is
lost? Need for redundancy?
> Choice of Video Management System - How
does the VMS work?
> What is the project budget?
Storage design prerequisites
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> Two different definitions of gigabyte in general use:
> 1,000,000,000 bytes or 109 bytes
– decimal definition,
– used in telecommunications (network speeds)
– Used by computer storage manufacturers
> 1,073,741,824 bytes, 10243, or 230 bytes
– Used for computer memory and file sizes.
– Microsoft uses this definition to display hard drive
sizes, as do most other operating systems and
programs by default
– By this definition, there are 1,0243, or
1024×1024×1024 bytes in a gigabyte equivalent to
1,024 megabytes
Storage measurement – why a GB isn’t always a GB!
Source: http://en.wikipedia.org/wiki/Gigabyte
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Edge storage, controlled by the camera/encoder will
be an important complement to VMS solutions and
provide new possibilities for efficient surveillance
> Recording redundancy
> HQ video in low bandwidth environment
> Remote site storage
Edge storage
VMS Central
storage
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> SD cards can continue recording and replace lost video if network problems arise.
Edge Storage and Failover Recording
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High-quality video in low bandwidth environments
Low bandwidth/Quality
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Remote site storage
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> There are three standards for storage capacity:
– SD up to 2 GB
– SDHC up to 32 GB
– SDXC up to 2 TB
> Axis supports SD/SDHC/SDXC memory cards with
ext4 file system, with support for up to 32 GB
storage in SDHC
> 64 GB SDXC cards can be used in
products with firmware 5.40 or higher.
Local Storage
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> The Speed Class of the memory card designates minimum writing performance to
record video
> SD, SDHC and SDXC cards support Normal Speed, denoted Class 2, Class 4,
Class 6, and High Speed, denoted Class 10
> A higher class = higher data transfer and data write speed. The host (camera)
determines the speed up to the maximum supported
by the flash memory
Local Storage
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How much can be stored on a 32 GB SD card?
5-8 days 3-5 days ½ -1 days
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How much can be stored on a 32 GB SD card?
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What is the expected lifetime of a 32 GB card?
14+ years 6+ years 2+ years
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New in FW 5.50
Internal
workspace
Internal WS
FW 5.40 FW 5.50
~20 GB used
for video
storage
~30 GB used
for video
storage
32 GB SD
Card
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> Redundancy during network disruptions or system maintenance
> Axis network cameras and video encoders
> SD/SDHC media: Axis firmware supports up to 32GB (Class 10)
> Use in low bandwidth environments
> Remote installations
> Mobile surveillance
Edge Storage Benefits
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Direct Attached Storage
Workstation
Network cameras
Switch
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Network Attached Storage - NAS
> Easy installation and administration
> Access via IP network
> Not recomended for “Live“ or “Buffer“ storage
Network cameras
Network Attached
Storage
Network
Switch
Workstation
with video
management
software
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Storage Area Network -SAN
> FC or IP based
> High speed network between servers and storage media
> High investment costs
> Ultra fast data access
> High capacity
> Redundancy
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> Redundant Array of Independent (or Inexpensive) Disks
> Multiple independent hard disks
are connected
> Key concepts
– Mirroring: data copied to more than one disk
– Striping: data split across more than one disk
– Parity: checksum used to rebuild replacement drive(s)
> Resources at:
– http://www.ecs.umass.edu/ece/koren/architecture/Raid/basicRAID.html
RAID
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… … A7 A5 A3
> RAID 0 (striping)
– Data distributed over several disks
– No redundancy!
– High performance
> RAID 1 (mirroring)
– Identical data on 2 disks
– Redundancy
– Lower capacity
RAID levels
A1
A8 A6 A4 A2
RAID 0
… … A4 A3 A2 A1
A4 A3 A2 A1
RAID 1
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RAID 5 > Stripes data and parity across drives
> Minimum number of drives required: 3
> One hot swappable drive
> Cope with 1 drive failure
… … P4 A9 A5 A1
A10 P3 A6 A2
RAID 5
… … A11 A7 P2 A3
A12 A8 A4 P1
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RAID 6
> Stripes data and parity across all drives
> Minimum number of drives required: 4
> 2 Hot swappable drives
> Cope with 2 disk failure
… … P4 A9 A5 A1
A10 P3 A6 A2
RAID 6
… … A11 A7 P2 A3
A12 A8 A4 P1
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RAID-10 > a combination of RAID 1 (mirroring) and RAID 0 (striping)
> Minimum number of drives required: 4
> better fault tolerance and rebuild performance
> Change failed disks without performance loss
… … A7 A5 A3 A1
A8 A6 A4 A2
RAID 10
… … A7 A5 A3 A1
A8 A6 A4 A2
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Summary
> Storage makes a real business impact as it can account for up to 30% of the
system cost!
> A GB is not always a GB!
> Knowing how the Video Management System works is essential!
> Storage media comes in many shapes, forms and prices
> Always make the end-user evaluate how mission critical the video stream is – the
more critical – the more redundancy and more complex storage
> Learn and make use of the AXIS Design Tool in your storage estimates
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Thank you!
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