3 raid 1, 4 raid and data protection, Table 22 raid 1 – ZyXEL Communications NSA-220 User Manual
Page 83
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Chapter 6 Storage Screens
NSA-220 User’s Guide
83
6.9.3 RAID 1
RAID 1 creates an exact copy (or mirror) of a set of data on another disk. This is useful when
data backup is more important than data capacity. The following figure shows two disks in a
single RAID 1 volume with mirrored data. Data is duplicated across two disks, so if one disk
fails, there is still a copy of the data.
As RAID 1 uses mirroring and duplexing, a RAID 1 volume needs an even number of disks
(two or four for the NSA).
RAID 1 capacity is limited to the size of the smallest disk in the RAID array. For example, if
you have two disks of sizes 150 GB and 200 GB respectively in one RAID 1 volume, then the
maximum capacity is 150 GB and the remaining space (50 GB) is unused.
Typical applications for RAID 1 are those requiring high fault tolerance without need of large
amounts of storage capacity or top performance, for example, accounting and financial data,
small database systems, and enterprise servers.
6.9.4 RAID and Data Protection
If a hard disk fails and you’re using a RAID 1 volume, then your data will still be available
(but at degraded speeds until you replace the hard disk that failed and resynchronize the
volume). However, RAID cannot protect against file corruption, virus attacks, files incorrectly
deleted or modified, or the NSA malfunctioning. Here are some suggestions for helping to
protect your data.
• Place the NSA behind a hardware-based firewall. It should have stateful packet inspection,
IDP (Intrusion Detection and Prevention), and anti-virus (like ZyXEL’s ZyWALL UTM
products for example).
• Use anti-virus software on your computer to scan files from others before saving the files
on the NSA.
• Keep another copy of important files (preferably in another location).
Table 22 RAID 1
A1
A1
A2
A2
A3
A3
A4
A4
DISK 1
DISK 2
- ISDN Terminal Adapter Omni.Net Lite
- ZYAIR G-360 V2
- DMA-1000 Series
- PLA-450
- EXT-108
- P-2602HWLNI
- ZyXEL ZyWALL 2WG
- P841C
- Network Device P-2302
- P-870M-I
- P-661HW Series
- Prestige 310
- 802.11g Wireless Access Point ZyXEL G-560
- P-2602HW
- Prestige 2602R Series
- 5 Series
- Prestige 623ME-T
- omni.net LCD series
- ZyXEL ZyAIR B-1000
- P-2302HWUDL-P1 Series
- ZyXEL ZyWALL 5
- Prestige 645R
- ZYWALL IDP 10
- 802.11g Wireless Firewall Router P-320W
- PRESTIGE 660R-6XC
- 56K Plus II
- P-2802HW-i
- ZYAIR AG-200
- POWERLINE PL-100
- HomePlug AV DMA-1100P
- Access Router P-660R-T
- omni.net LCD+M
- G-162
- PL-100
- ZyXEL ZyAIR A-6000
- ZyXEL ZyAIR AG-225H
- 2304R-P1
- XTREMEMIMO M-302
- nbg334s
- P-793H 601156
- Ethernet Extension Card EEC1020
- P-871M
- Prestige 128L
- P-2812HNU-51c
- ZyWALL SSL 10
- NWD2105
- G-302 V3
- G-302 V3
- COMPACT P-660R
- Internet Security Gateway 10~100 Series
- AG-100
- P-872H
- Prestige 304
- P-2302R-P1 Series
- 802.11g Wireless VDSL2 4-port Gateway P-870HW-I1
- ZyXEL ZyWALL 35
- PRESTIGE 2602HW
- P-660RU-T V2
- P-660RU-T V2
- 65-100-060607B
- Prestige 650HW
- P-662H-D
- ZyXEL ZyAIR B-4000
- ZYAIR G-300
- Network Device 56K
- PRESTIGE 334
- Prestige 100WH
- Prestige 1600
- G-102
- PLA-407
- P-971M
- NSA-2400
- NSA-2400
- P-660H Series
- P-2602H
- AG-120
- AG-220
- P-662H
- 2864I
- ZyWALL 70
- P-2802HW(L)-IX
- PRESTIGE 324
- Parental Control Gateway HS100/HS100W
- 202H
- P-2602RL-DxA Series
- PRESTIGE 128
- Prestige 941
- P-2301
- PLA470 V2
- Prestige 202
- P-660H-T Series
- ZyXEL ZyAIR G-2000
- Prestige 645R-A Series
- P-660HW-TX V3
- ZyXEL ZyAIR AG-225H v2
- Internet Security Gateway ZyWALL 2 Series
- Prestige 128IMH
- P-660N-T1A
- Network Storage Appliance NSA-220
- PLA-470
- PLA-470
- G.SHDSL.bis Router P-791R v2
- 802.11G
- 401
- 660H Series
- Bridge/Router G-2000s
- WiMAX XOHM
- P-2302HW-P1 Series
- 2002 Series
- P-334
- PLA402 v2
- NWD-270N
- PLA-401 v3
- P-662HW-D
- ADSL2+ Ethernet Gateway P-660R-T Series
- P-334W
- ZyXEL XtremeMIMO M-102
- ZyXEL XtremeMIMO M-302
- 35 Series
- P-335WT
- OMNI 56K
- NBG410W3G Series
- Prestige 28641
- NWA3550
- PRESTIGE 153X
- ZyXEL ZyWALL 30W
- Prestige 642R Series
- NWA-3163
- ISDN Internet Access Router 202H Plus
- ZyXEL ZyAIR G-405
- P-660HW-Dx v2
- 802.11g Wireless Firewall Router 1-P-320W
- NWD210N
- NWD210N
- ZyXEL ZyAIR B-400
- ADSL2+ 4-port Gateway P-660H-D1
- VDSL2 Line Card VLC1324G
- PRESTIGE 871
- ZyXEL ZyWALL IDP 10
- ZyXEL ZyAIR 100
- NWA3160
- P-320W
- ZyXEL AG-220
- ZYWALL USG 1000
- PLA401 v2
- P-2608HWL-Dx Series
- Auto Configuration Server Vantage Access
- NBG318S v2
- NWA570N
- G-210H
- G-2000 Plus
- WPA-1000
- NBG-415N
- NBG-415N
- G.SHDSL.bis 4-port Security Gateway P-793H
- PLA450 Series
- P-660H-D Series
- P-663H-51
- ZyXEL ZyAIR B-120
- ADSL 2+ Gateway P-660HW-T1
- P-660R-T1/T3 V2
- Wireless LAN PCI Card B-300
- G-2000 Plus V2
- 802.11b/g Wireless Access Point NWA-1100
- ADSL VoIP IAD with 802.11g Wireless 2602HW Series
- ADSL/ADSL2/ADSL2+ Router 660R-6xC Series
- Internet Security Gateway ZyWALL 100
- Wireless LAN USB Adapter ZyAIR 200
- ZyXEL ZyAIR AG-320
- ZYWALL10
- 650 Series
- NBG334W
- NBG334W
- G-4100
- Prestige 630
- IES-612-51A
- ZyAIR G-220
- NBG334SH
- Prestige 650
- 802.11G WIRELESS P-334WT
- omni.net D
- FN-300 Series
- P-660RU-Tx v3s SERIES
- Network Device NXC-8160s
- P-792H v2
- P-2302R
- G-360
- G-360
- PLA-401
- P-660R-Tx v2 Series
- X6004
- ELITE 2864I
- MI-7248PWR
- 630
- P-660M
- 56K Plus Series
- 128MH
- ZyWALL 2 Plus
- G-270S
- 802.11a/g Wireless CardBus Card ZyXEL AG-120
- P-2002
- P-2602H-DXA
- ZYWALL 35
- ZyXEL ExpWave 240B
- NBG-419N
- PLA-400 v2
- P-660HW-D
- P-870HW Series
- Broadband Security Gateway P-312
- 802.11g Wireless ADSL2+ 4-port VoIP IAD P-2602HWNLI
- NWD-490
- Internet Security Appliance ZyWALL5UTM 4.0
- P-660HW-T v2
- Prestige 480
- ADSL2+ P-661H-D
- Omni TA128
- NBG-318S
- Prestige 643
- Prestige P-870HW-51a v2
- FSG2200HNU
- P-2802H(W)(L)-I Series
- PLA-4xx
- U-336S
- Prestige 642
- P-2900
- Prestige 2002
- P-870M-Ix v2
- PPC 10
- 802.11g Wireless USB Adapter ZyXEL G-200
- 100 Series
- 480
- WLAN 802.11n USB Adapter NWD271N
- ZyXEL ZyWALL 70
- P-2608HWL-DX
- NWD-170N
- P-2900-4HB
- NBG420N
- Draft 802.11n Wireless Broadband 1-NBG-415N
- 2864
- P-202H Plus v2
- Prestige 2302R
- ZyXEL ZyWALL P1
- ZyXEL Vantage VSG-1000
- PLA401
- Prestige 2002 Series
- N4100
- N4100
- Prestige 841
- ADSL2+ Ethernet / USB Router P-660RU-Tx v2
- P-870MH-C1
- Prestige 100MH
- NBG4115
- G-200v2
- P-2602HWNLI
- P-660HN-F1A
- 802.11g Wireless Ethernet Adapter 1-G-470
- 802.11g High Power Wireless Router P-334WH
- NWA-3160 Series
- Prestige 650H-E Series
- ACCESSING INTERNET & INTRANET omni series
- P630M
- ZyXEL ZyWALL 2WE
- NWD-370N
- NWD-370N
- 802.11g HomePlug AV ADSL2+ Gateway P-660HWP-D1
- 662H Series
- Prestige 794M
- G-220 v3
- P-660R-D Series
- P-334WT
- P-334WHD
- P-660HN-TxA
- 56K
- Prestige 660HW Series
- Wireless CardBus Card ZyAIR G-110
- WAP3205
- NBG-417N
- ZyXEL ZyWALL USG-1000
- Cable Modem Router with Wireless P-974 series
- 802.11A/B/G WIRELESS ACCESS POINT / BRIDGE G-570U
- ADSL2+ 4-port Gateway P-660H-D Series
- Prestige 660H Series
- 802.11g Wireless MIMO PCI Card ZyXEL M-302
- Powerline Ethernet Multiplug Center PLA491
- 802.11g HomePlug AV ADSL2+ Gateway P-660HWP-Dx
- NWD310N
- NWD310N
- Prestige 314 PLUS
- ADSL2+ Access Router P-660R-T1 v2
- 10
- 2602HW-C
- NBG-510S
- PLA-4xx Series
- Prestige 661H Series
- 802.11g Wireless CardBus Card ZyXEL G-162
- ZYWALL 100
- Intelligent Broadband Sharing Gateway P-324
- G-4100 v2
- ADSL2+ Ethernet/USB Gateway 660RU-Tx Series
- P-630-S
- NBG410W3G
- 3G Wireless Router NBG410W3G
- PRESTIGE 202H
- Centralized Network Management Vantage CNM
- ZyXEL ZyAIR AG-220
- Prestige 2602H Series
- P-870H-51a v2
- P-661H-D Series
- P-660HW-TX
- 802.11 Wireless Digital Media Adaptor DMA-1000W
- 802.11G G-210H
- MS-7206
- XtremeMIMO m-202
- P-661HW-D
- G-302
- ZyXEL XtremeMIMO X-550
- P-2304R-P1
- P-660HW-D Series
- G-100
- Omni 288S
- WLAN PCI Card IEEE802.11b
- Network Storage NSA-220 Plus
- P-2602H Series