APC RAID Subsystem SCSI-SATA II User Manual Page 19
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SAS / SATA II NAS System
User’s Manual
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RAID 6 is similar to RAID 5 in that data protection is achieved by writing parity
information to the physical drives in the array. With RAID 6, however, two sets of parity
data are used. These two sets are different, and each set occupies a capacity equivalent
to that of one of the constituent drives. The main advantage of RAID 6 is High data
availability – any two drives can fail without loss of critical data.
In summary:
RAID 0 is the fastest and most efficient array type but offers no fault-tolerance. RAID
0 requires a minimum of one drive.
RAID 1 is the best choice for performance-critical, fault-tolerant environments. RAID
1 is the only choice for fault-tolerance if no more than two drives are used.
RAID 3 can be used to speed up data transfer and provide fault-tolerance in single-
user environments that access long sequential records. However, RAID 3 does not
allow overlapping of multiple I/O operations and requires synchronized-spindle drives
to avoid performance degradation with short records. RAID 5 with a small stripe size
offers similar performance.
RAID 5 combines efficient, fault-tolerant data storage with good performance
characteristics. However, write performance and performance during drive failure is
slower than with RAID 1. Rebuild operations also require more time than with RAID 1
because parity information is also reconstructed. At least three drives are required
for RAID 5 arrays.
RAID 6 is essentially an extension of RAID level 5 which allows for additional fault
tolerance by using a second independent distributed parity scheme (two-dimensional
parity). Data is striped on a block level across a set of drives, just like in RAID 5, and
a second set of parity is calculated and written across all the drives; RAID 6 provides
for an extremely high data fault tolerance and can sustain multiple simultaneous
drive failures. It is a perfect solution for mission critical applications.
- SAS/SATA II NAS System 1
- Table of Contents 2
- Preface 7
- FCC Compliance Statement 8
- Before You Begin 9
- SAS / SATA II NAS System 10
- User’s Manual 10
- Chapter 1 Introduction 11
- 1.1 Key Features 12
- 1.3 RAID Concepts 16
- RAID Management 20
- 1.4 Array Definition 21
- 1.5 High Availability 22
- 3.2 Powering On 28
- 3.3 Installing Hard Drives 30
- Main Menu 37
- Chapter 5 RAID Management 47
- 5.2 RAID Set Functions 49
- 5.2.2 Delete RAID Set 50
- 5.2.4 Offline RAID Set 54
- 5.2.6 Create Hot Spare 57
- 5.2.7 Delete Hot Spare 57
- 5.2.8 Rescue Raid Set 58
- 5.3 Volume Set Function 59
- 5.3.2 Create Raid 30/50/60 62
- 5.3.3 Delete Volume Set 63
- 5.3.4 Modify Volume Set 64
- 5.3.5 Check Volume Set 67
- 5.3.7 Stop Volume Check 70
- 5.4 Physical Drive 71
- 5.4.4 Identify Enclosure 73
- 5.5 System Controls 75
- 5.5.4 SNMP Configuration 79
- 5.5.5 NTP Configuration 80
- 5.6 Information Menu 84
- 5.6.2 System Information 85
- 5.6.3 Hardware Monitor 86
- PART II proNAS System 95
- Chapter 7 Introduction 96
- Chapter 8 proNAS Manager 104
- 8.1 Volume Manager 105
- 8.1.3 Volume Snapshot 118
- 8.1.3.3 Delete Snapshots 124
- 8.1.4 Volume Replication 126
- 8.1.5 iSCSI 134
- 8.2 Network Manager 142
- 8.2.2 Internet Gateway 146
- 8.2.3 SNMP/MRTG 147
- 8.2.4 Network Test 148
- 8.3 Account Manager 149
- 8.3.1.3 NIS Authentication 152
- 8.4 Share Manager 161
- 8.4.1 Share Management 162
- 8.4.1.2 Applying ACL 163
- 8.4.1.3 Modifying a Share 163
- 8.4.1.4 Deleting a Share 164
- 8.4.3 Protocol Setting 167
- 8.4.3.2 NFS 168
- 8.4.4.1 Group 169
- 8.4.4.2 Account 170
- 8.4.4.3 IP Address 172
- 8.4.6 Duplication 179
- 8.4.7 Default Share 183
- 8.5 System Manager 184
- 8.5.3 Report tab 187
- 8.5.4 Time tab 188
- 8.5.5 Serial Ports tab 189
- 8.5.6 Power tab 190
- 8.5.7 Reboot tab 191
- 8.5.8 Service tab 192
- 8.5.9 Status tab 195
- 8.6 Backup Manager 197
- 8.6.3 Tape Control 204
- 7. Click “Save” again 207
- 8.7 Log Manager 221
- 8.8 Event Manager 222
- Event Purpose 223
- Chapter 9 File Manager 225
- 9.2 Logon to File Manager 227
- Chapter 10 proBackup 231
- 10.3 Create Backup Plan 234
- 10.4 Restore Backup 240
- 10.5 Account Detail 241
- 11.3 ProNAS HA Properties 254
- 11.6 License Registration 258
- 11.7 Event Log Properties 259
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