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Hot-spare, RAID and Data Protection

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Chapter 4 Web Configurator Basics following example shows data stripped across three disks (A1 to A3 in the first strip for example) with parity information (AP) on the fourth disk. Table 26 RAID 5 A1 A2 A3 AP B1 B2 BP B3 C1 CP C2 C3 DP D1 D2 D3 DISK 1 DISK 2 DISK 3 DISK 4 The capacity of a RAID 5 array is the smallest disk in the RAID set multiplied by one less than the number of disks in the RAID set. For example, if you have four disks of sizes 150 GB, 150 GB, 200 GB and 250 GB respectively in one RAID 5 array, then the maximum capacity is 450 GB (3 * 150 GB, the smallest disk size) and the remaining space (300 GB) is unused. Typical applications for RAID 10 are transaction processing, relational database applications, enterprise resource planning and other business systems. For write-intensive applications, RAID 1 or RAID 1+0 are probably better choices, as the performance of RAID 5 will begin to substantially decrease in a write-heavy environment. Hot-spare A RAID 1 or RAID 5 array with a hot-spare operates as a three-disk RAID 1 or RAID 5 array with the fourth disk on standby. The standby disk automatically comes into play if a disk in the array fails. The advantage of a hot-spare is that if a disk fails, then the array resynchronizes automatically with the standby disk and operates at healthy array speed after the resynchronization. Note: You need four hard disks installed to use RAID 10, RAID 5 or RAID 5 with hotspare. RAID and Data Protection If a hard disk fails and you're using a RAID 1, RAID 10, or RAID 5 array then your data will still be available (but at degraded speeds until you replace the hard disk that failed and re-synchronize the array). However, RAID cannot protect against file corruption, virus attacks, files incorrectly deleted or modified, or the NAS malfunctioning. NAS540 User's Guide 71

Section	Page
NAS540	1
Contents Overview	3
Table of Contents	5
User’s Guide	13
Getting to Know Your NAS	15
1.1 Overview	15
1.1.1 Hard Disks	16
1.1.2 SD Card	16
1.1.3 Power Button	16
1.1.4 COPY/SYNC Button	16
1.1.5 RESET Button	17
NAS Starter Utility	19
2.1 Overview	19
2.2 Starting the NAS Starter Utility	19
2.3 NAS Seeker Screen	19
2.4 Main NAS Starter Utility Screen	21
2.4.1 Directory of the NAS	22
2.5 Network Drive	22
2.6 Configure System Settings	23
zCloud	27
3.1 zCloud	27
Web Configurator Basics	29
4.1 Overview	29
4.2 Accessing the NAS Web Configurator	29
4.3 Desktop	32
4.3.1 Status Center	33
4.4 Storage	34
4.4.1 Storage Volume	35
4.4.2 Disk Group	56
4.4.3 Creating a Disk Group	59
4.4.4 Hard Disk	61
4.4.5 S.M.A.R.T	61
4.4.6 SMART Info	63
4.4.7 Technical Reference	67
4.5 Playzone Screens	72
4.5.1 Media Server Screens	74
4.5.2 Now Playing (Music)	76
4.5.3 Exif and Google Maps (Photos)	76
4.5.4 Slideshow (Photos)	77
4.5.5 File Browser	78
4.5.6 Share and Folder Names	81
4.5.7 Application Zone	82
4.5.8 Playzone Settings	83
4.6 Administration Screens	84
4.6.1 Global Administration Icons	85
4.6.2 Navigation Panel	86
4.6.3 Main Window	88
4.6.4 Status Messages	88
4.6.5 Common Administrator Screen Icons	88
4.6.6 Session Example (Windows)	89
Tutorials	91
5.1 Overview	91
5.2 Windows 7 Network	91
5.2.1 If the NAS Icon Does Not Display	93
5.2.2 NAS Icon Right-click Options	94
5.3 Windows 7 Network Map	95
5.4 Playing Media Files in Windows 7	97
5.5 Windows 7 Devices and Printers	97
5.5.1 Windows 7 Desktop Shortcut	99
5.6 File Sharing Tutorials	100
5.6.1 Creating a User Account	100
5.6.2 Creating a Share	101
5.6.3 Creating a Group	103
5.6.4 Accessing a Share From Windows Explorer	104
5.6.5 Accessing a Share Using FTP	106
5.6.6 Accessing a Share Through the Web Configurator	107
5.7 Download Service Tutorial	108
5.7.1 Copying/Pasting a Download Link	108
5.7.2 Configuring the Download Service Preferences	111
5.7.3 Using Download Service Notification	114
5.8 Broadcatching Tutorial	117
5.9 Printer Server Tutorial	121
5.10 Copy and Flickr Auto Upload Tutorial	123
5.11 FTP Uploadr Tutorial	124
5.12 Web Configurator’s Security Sessions	127
5.12.1 Customizing the NAS’s Certificate	128
5.12.2 Downloading and Installing Customized Certificate	129
5.12.3 Turn on the NAS’s Web Security	133
5.13 Using FTPES to Connect to the NAS	139
5.14 Using a Mac to Access the NAS	141
5.14.1 Finder	141
5.14.2 Go Menu	143
5.15 How to Use the BackupPlanner	143
5.15.1 Creating an Archive Backup	144
5.15.2 Creating a Synchronization Backup	147
5.15.3 Restoring Archived Files by Backup Job	150
5.15.4 Restoring by Backup Files	153
Technical Reference	157
Status Screen	159
6.1 Overview	159
6.2 Status Screen	159
System Setting	163
7.1 Overview	163
7.2 What You Can Do	163
7.3 What You Need to Know	163
7.4 Firmware Upgrade Screen	164
7.5 Package Management Screen	165
7.5.1 Displaying the Package Information	167
7.6 Server Name Screen	168
7.7 Date/Time Screen	169
External Volume	173
8.1 Overview	173
8.1.1 What You Need to Know About External Storage	173
8.2 External Volume Screen	173
8.2.1 Volume Status	174
8.3 Creating an External (USB or SD) Volume	174
8.3.1 External Disks	175
Network	177
9.1 Overview	177
9.2 What You Can Do	177
9.3 What You Need to Know	177
9.4 TCP/IP Screen	179
9.5 UPnP Port Mapping Screen	182
9.5.1 UPnP and the NAS’s IP Address	183
9.5.2 UPnP and Security	183
9.5.3 The NAS’s Services and UPnP	184
9.5.4 Configuring UPnP Port Mapping	184
9.6 PPPoE Screen	186
9.7 Telnet Service Screen	187
9.8 DyDNS Screen	188
Applications	191
10.1 Overview	191
10.2 What You Can Do	191
10.3 What You Need to Know	191
10.4 FTP Server Screen	194
10.5 Media Server Screens	195
10.5.1 Media Server Share Publish Screen	196
10.5.2 Media Server SqueezeCenter Screen	196
10.6 iTunes Server Screen	197
10.7 Download Service Screen	197
10.7.1 Adding a Download Task	201
10.7.2 Configuring General Download Settings	203
10.7.3 Configuring the P2P Download Settings	205
10.7.4 Edit IP Filter	207
10.7.5 Selecting Files to Download	208
10.7.6 Displaying the Task Information	209
10.8 Web Publishing Screen	210
10.9 Broadcatching Screen	211
10.9.1 Adding a Broadcatching Channel	213
10.9.2 Editing a Broadcatching Channel	216
10.10 Print Server Screen	217
10.10.1 Print Server Rename	218
10.11 Copy/Sync Button Screen	219
10.12 Technical Reference	220
10.12.1 Sharing Media Files on Your Network	220
10.12.2 Download Service	221
10.12.3 Download Service Notification	222
10.12.4 P2P Download Security	222
10.12.5 Web Publishing Example	224
10.12.6 Web Publishing	226
10.12.7 Channel Guides for Broadcatching	226
10.12.8 Printer Sharing	227
10.12.9 Copying Files	228
10.12.10 Synchronizing Files	228
10.13 Google Drive	230
10.13.1 Account Setting Screen	231
10.13.2 Account Setting Add Screen	232
10.13.3 Update Period Screen	235
10.14 Syslog Server Screen	235
Packages	239
11.1 Overview	239
11.2 What You Can Do	239
11.3 NFS Screen	239
11.3.1 Add/Edit NFS Share	240
11.3.2 NFS Session	241
11.4 TFTP Server Screen	242
11.5 pyLoad Screen	243
11.6 ownCloud Setup	244
11.7 Memopal	247
Auto Upload	251
12.1 Overview	251
12.2 What You Can Do	251
12.3 What You Need to Know	251
12.4 Flickr/YouTube Screen	251
12.4.1 Configuring the Flickr Settings	252
12.4.2 Configuring the YouTube Settings	257
12.5 FTP Uploadr Screen	260
12.5.1 Adding or Editing an FTP Server Entry	261
12.5.2 FTP Uploadr Preferences Screen	262
Dropbox	265
13.1 Overview	265
13.2 Dropbox Screen	265
13.3 How to Use Dropbox with the NAS	267
Using Time Machine with the NAS	269
14.1 Overview	269
14.2 Time Machine Screen	269
14.3 Using Time Machine	269
Users	273
15.1 Overview	273
15.2 What You Can Do	273
15.3 Users Screen	273
15.3.1 User Icons	275
15.3.2 Adding or Editing an Account	275
15.3.3 Usernames	277
15.4 Displaying User Info	278
Groups	279
16.1 Overview	279
16.2 What You Can Do	279
16.3 Groups Screen	279
16.3.1 Adding or Editing a Group	280
16.3.2 Group Names	281
Shares	283
17.1 Overview	283
17.2 What You Can Do	283
17.3 Shares Screen	284
17.3.1 Adding or Editing Share	286
17.3.2 Configuring Advanced Share Access	287
17.3.3 Public and ANONYMOUS Share Access Rights	288
17.4 Recycle Bin Configuration Screen	288
17.4.1 Recycle Bins	288
17.4.2 Configuring Recycle Bins	289
17.5 Share Browser Screen	289
17.5.1 Moving or Copying Files	291
WebDAV	293
18.1 Overview	293
18.2 WebDAV Screen	293
18.3 How to Use NetDrive with the NAS	294
Maintenance Screens	297
19.1 Overview	297
19.2 What You Can Do	297
19.3 Power Screen	297
19.3.1 Editing the Power Control Schedule Screen	300
19.4 Log Screen	301
19.4.1 Report Config Screen	302
19.4.2 Email Setting	303
19.4.3 Report Setting	304
19.4.4 Syslog Server Setting	304
19.5 Configuration Screen	305
19.6 SSL Certification	306
19.6.1 Modifying or Creating a Certificate	307
19.7 Shutdown Screen	308
19.8 Technical Reference	309
19.8.1 Log Classes	309
19.8.2 Log Severity Levels	310
19.8.3 Log Messages	310
Protect	319
20.1 Overview	319
20.2 What You Can Do	319
20.3 Backup Screens	319
20.3.1 Backup: Step 1	320
20.3.2 Backup: Step 2	323
20.3.3 Backup: Step 3	326
20.3.4 Backup: Step 4	327
20.3.5 Edit Job Screen	328
20.3.6 Edit Job: Step 1	328
20.3.7 Edit Job: Step 2	330
20.3.8 Restore Archive Screen	331
20.3.9 Restore Archive: Step 1	331
20.3.10 Restore Archive: Step 2	332
20.3.11 Restore Archive: Step 3	332
20.4 Restore Screen	333
20.4.1 Restore: Step 1	334
20.4.2 Restore: Step 2	335
20.4.3 Restore: Step 3	336
20.4.4 Restore: Step 4	337
20.5 Configuration File Backup and Restoration	337
Troubleshooting	339
21.1 Troubleshooting Overview	339
21.2 Power, Hardware, Connections, and LEDs	339
21.3 NAS Starter Utility	341
21.4 NAS Login and Access	342
21.4.1 Enabling Scripting of Safe ActiveX Controls	344
21.5 I Cannot Access The NAS	346
21.6 Users Cannot Access the NAS	346
21.7 External USB Drives	348
21.8 Storage	348
21.9 Firmware	348
21.10 File Transfer	349
21.11 Networking	349
21.12 Some Features’ Screens Do Not Display	350
21.13 Media Server Functions	350
21.14 Download Service and Broadcatching Functions	352
21.15 Web Publishing	353
21.16 Auto Upload	354
21.17 Package Management	355
21.18 Backups	355
21.19 Google Drive	356
Customer Support	357
Product Specifications	363
22.1 LEDs	363
22.2 Supported Media Server Content Formats	364
22.3 Supported iTunes Server Content Formats	364
Legal Information	365

Match case Limit results 1 per page

Chapter 4 Web Configurator Basics

NAS540 User’s Guide

following example shows data stripped across three disks (A1 to A3 in the first strip for example)

with parity information (AP) on the fourth disk

The capacity of a RAID 5 array is the smallest disk in the RAID set multiplied by one less than the

number of disks in the RAID set. For example, if you have four disks of sizes 150 GB, 150 GB, 200

GB and 250 GB respectively in one RAID 5 array, then the maximum capacity is 450 GB (3 * 150

GB, the smallest disk size) and the remaining space (300 GB) is unused.

Typical applications for RAID 10 are transaction processing, relational database applications,

enterprise resource planning and other business systems. For write-intensive applications, RAID 1

or RAID 1+0 are probably better choices, as the performance of RAID 5 will begin to substantially

decrease in a write-heavy environment.

Hot-spare

A RAID 1 or RAID 5 array with a hot-spare operates as a three-disk RAID 1 or RAID 5 array with the

fourth disk on standby. The standby disk automatically comes into play if a disk in the array fails.

The advantage of a hot-spare is that if a disk fails, then the array resynchronizes automatically with

the standby disk and operates at healthy array speed after the resynchronization.

Note: You need four hard disks installed to use RAID 10, RAID 5 or RAID 5 with hot-

spare.

RAID and Data Protection

If a hard disk fails and you’re using a RAID 1, RAID 10, or RAID 5 array then your data will still be

available (but at degraded speeds until you replace the hard disk that failed and re-synchronize the

array). However, RAID cannot protect against file corruption, virus attacks, files incorrectly deleted

or modified, or the NAS malfunctioning.

Table 26

RAID 5

DISK 1

DISK 2

DISK 3

DISK 4