• Share
  • Email
  • Embed
  • Like
  • Save
  • Private Content
GeoVision : CCTV Solutions : RAID vs Non-RAID System for Storing Surveillance Data
 

GeoVision : CCTV Solutions : RAID vs Non-RAID System for Storing Surveillance Data

on

  • 1,138 views

RAID vs Non-RAID System

RAID vs Non-RAID System
for Storing Surveillance Data

Statistics

Views

Total Views
1,138
Views on SlideShare
1,136
Embed Views
2

Actions

Likes
0
Downloads
9
Comments
0

1 Embed 2

http://www.slashdocs.com 2

Accessibility

Categories

Upload Details

Uploaded via as Adobe PDF

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

    GeoVision : CCTV Solutions : RAID vs Non-RAID System for Storing Surveillance Data GeoVision : CCTV Solutions : RAID vs Non-RAID System for Storing Surveillance Data Document Transcript

    • RAID vs Non-RAID System for Storing Surveillance Data Article ID: GV39-12-3-27-t Release Date: 3/27/20121. IntroductionAlthough RAID has become increasingly popular in recent years, this document explains whyusing non-RAID systems with regular backup is more practical for storing surveillance data. Ifyou do choose to use RAID though, we recommend building RAID 5 using hardware RAID.2. Why We Recommend Using Non-RAID with GV-SystemThere are several drawbacks of using RAID systems to store surveillance data. RAID reducesspace efficiency and does not provide sufficient data protection. RAID does not completelysubstitute regular backup and we suggest using non-RAID systems with GV-System’s freebackup solution.Losing All Data When Fault Tolerance ExceededWhen recording video for surveillance purposes, hard disks tend to have a high failure ratebecause they are constantly reading and writing data. Multiple hard drive failure happens fromtime to time and in a RAID system, data on all hard disks would be lost if the fault tolerance ofthe RAID level is exceeded.All data is lost if• Any of the hard disks fail in RAID 0• More than 1 hard disk fails in RAID 1 with two hard drives• More than 1 hard disk fails in RAID 5In a non-RAID system, data in all other hard disks will be intact and only the data on the failedhard disk will be lost. 1
    • Reduced Space Efficiency When Using RAID 1 or AboveStoring recorded video often requires a large amount of storage space. In RAID 1 or above,the amount of space you can utilize is reduced because data is replicated. Min # of HDD Storage Capacity Examples requiredNon-RAID 1 Full storage capacity 1 TB HDD x 2 = 2 TB capacityRAID 0 2 Full storage capacity 1 TB HDD x 2 = 2 TB capacityRAID 1 2 50% storage capacity 1 TB HDD x 2 = 1 TB capacity 1 TB HDD x 4 = 2 TB capacityRAID 5 3 # of HDD – 1 HDD 1 TB HDD x 3 = 2 TB capacity 1 TB HDD x 4 = 3 TB capacityWith non-RAID or RAID 0, the capacity of all hard disks can be utilized. However, in RAID 1,an identical copy of the data is stored in each hard disk, so the usable capacity will be reducedby half. In RAID 5, the capacity of 1 hard drive is used to store the redundant data, so thestorage capacity is reduced to the number of hard drives minus 1 hard drive. The lower spaceefficiency in RAID 1 or above is especially uneconomical at a time of soaring hard disk prices. Non-RAID RAID 1 A E A A B F B = B C G C C D H D D Disk 1 Disk 2 Disk 1 Disk 2 (500 GB) (500 GB) (500 GB) (500 GB) Total capacity: 1000 GB Total capacity: 500 GBRead and Write Speed ComparisonBelow we rank non-RAID, RAID 0, RAID 1 and RAID 5 in the order of fastest to slowest readand write speed.RAID 0 > Non-RAID > RAID 5 > RAID 1Some people prefer RAID for faster read and write speed, but the data access speed of anon-RAID system is actually almost as fast as that of RAID 0 and slightly better than RAID 5. 2
    • Backup Server: GeoVision’s Free Backup MechanismGV-System provides safe and free backup mechanism using Backup Server.With Backup Server, the GV-System can back up recorded files to the storage system bothlocally or over the Internet to multiple drives. When Backup Server is enabled, a copy ofrecorded files will automatically be backed up to the storage system.The Backup Server supports any storage system protocol which can add itself to Windowsand be formatted by Windows Disk Management. The following diagram shows the possibletypes of storage systems the Backup Server can support. Network Storage Local Storage iSCSI GV-System eSATA NAS USB + Thecus 5200N Internal Hard Drive Backup ServerFor details on Backup Server, see 11.9 Backup Server, DVR User’s Manual on theSurveillance System Software DVD.3. Setting Up a RAID 5 SystemIf you do choose to use GV-System with a RAID system, building a RAID 5 system providesthe following advantages:• More efficient storage capacity compared with RAID 1 or above• Data access speed close to non-RAID systems• Protection against 1 hard drive failureIt is also recommended to use a GeoVision or third-party RAID Controller Card for betterperformance instead of using software RAID. 3
    • Setting Up RAID SystemBelow is an example of how to set up a RAID 5 system using GeoVision’s RAID ControllerCard. The optional RAID Controller Card can be purchased to support hardware RAIDfunction.Note: Different RAID Controller Cards will have different settings. Refer to thedocumentation of your RAID Controller Card for proper setup.1. After installing the RAID Configuration Utility from the supplied software CD, select Controller #01 (PCI) and click the Launch Browser button to access the Web interface.2. Type the default username admin and password 0000 to log in the Web interface. 4
    • 3. In the left menu, click Quick Function and select Quick Create to start the Quick Setup.4. Use the Select RAID Level drop-down list to select RAID 5. 5
    • 5. If the capacity of a single RAID group exceeds 2 TB, select 64bit LBA or 4K Block in the Greater Two TB Volume Support drop-down list. 64bit LBA: 64-bit LBA with 512 sectors (blocks). The option works on different OS that supports 16 bytes CDB. 4K Block: 32-bit LBA with 4K sectors (blocks). It changes the sector size from default 512 bytes to 4K bytes. The size of a single file cannot exceed 16 TB.Tip: Select 64 bit LBA if you are using Windows XP and select 4K block if you are usingWindows 7 or Windows Server 2008.6. Select Confirm The Operation and click the Submit button to begin building the RAID system.To see the status or the progress of the RAID creation, click Information in the left menu andselect RAID Set Hierarchy. 6
    • 4. FAQQ1: What’s the difference between using the built-in RAID function on the motherboardand using a RAID controller card?Some motherboards come with built-in software RAID where the RAID function is performedby the CPU of the PC. Although no additional hardware is required, software RAID tends todrain system resources and decrease the CPU’s efficiency. On the other hand, hardwareRAID uses a RAID card to process the data externally and does not add burden to the PC.Q2: Can I build a RAID group using hard disks from different brands?You can build a RAID group using hard disks from different brands, but you need to considertwo factors:(a) Storage size: When using hard disk with different storage capacity, the storage capacity may be based on the smallest hard disk. For example, if you create a RAID 1 using one 1 TB hard disk and one 500 GB hard disk, the space you can utilize will be 500 GB.(b) Rotational speed: Data access performance will be affected if hard disks of different rotational speed are used.Consequently, creating a RAID group using hard disks of different sizes and rotational speedis not recommended. 7
    • Q3: Can I build a RAID system on GV-Hot Swap DVR System?Building a RAID system on GV-Hot Swap DVR System is not recommended, but if you decideto do so, creating a RAID 5 system will provide a fault tolerance of one hard disk and betterspace efficiency compared to other RAID levels. You must purchase the accessory GV-RAIDController Card and have it installed before the system is shipped to you.Note: GV-RAID Controller Card only supports 8 / 4-bay models.The maximum number of channels each hard disk can record is listed below:Analog Cameras Maximum Number of Channels per HDD Resolution Frame Rate Bit Rate (8 / 4-Bay Models) CIF 30 fps 0.26 Mbps 32 Channels D1 (SW) 15 fps 0.53 Mbps 32 Channels D1 (HW) 30 fps 2.6 Mbps 16 ChannelsNote: The maximum number of channels supported for GV-3008 / 4008 is 16 channels.IP Cameras Maximum Number of Channels per HDD Resolution Frame Rate Bit Rate (8 / 4-Bay Models) 1.3 MP 30 fps 3.7 Mbps 28 Channels 2.0 MP 30 fps 6.7 Mbps 16 Channels 3.0 MP 20 fps 5.7 Mbps 24 ChannelsNote: The data is obtained using H.264 codec. 8
    • Q4: Can I store data recorded by GV-Recording Server on a RAID system?Storing data recorded by GV-Recording Server on a RAID system is not recommended, but ifyou decide to do so, you can choose a third-party RAID controller card or use GV-Hot SwapRecording Server System with the optional GV-RAID Controller Card. You must purchase theaccessory GV-RAID Controller Card and have it installed before the system is shipped to you.Note: GV-RAID Controller Card only supports 8 / 4-bay models.The maximum number of channels each hard disk can record is listed below.GV-Hot Swap Recording Server System with GV-RAID Controller Card Maximum Number of Channels per HDD Resolution Frame Rate Bit Rate (8 / 4-Bay Models) 1.3 MP 30 fps 3.7 Mbps 28 Channels 2.0 MP 30 fps 6.7 Mbps 16 Channels 3.0 MP 20 fps 5.7 Mbps 24 ChannelsGV-Recording Server (Software only) Resolution Frame Rate Bit Rate Maximum Number of Channels per HDD 1.3 MP 30 fps 3.7 Mbps 32 Channels 2.0 MP 30 fps 6.7 Mbps 21 Channels 3.0 MP 20 fps 5.7 Mbps 32 Channels 9