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RAID 5
(striping with interspersed parity). Allows one hard disk to fail or being unplugged.
RAID 6
(2-dimensional parity protection). RAID 6 allows two hard disks to fail or being unplugged. If two hard disks need to be rebuilt at
the same time, it will rebuild the fi rst one and then the other one.
RAID 0+1
(mirroring of the member RAID 0). Allows two hard disks to fail or being unplugged, but the hard disks must in the same array.
RAID 10
(striping over the member RAID 1). Allows two hard disks to fail or being unplugged, but the hard disks must in different array.
RAID 30
(striping over the member RAID 3). Allows two hard disks to fail or being unplugged, but the hard disks must in different array.
RAID 50
(striping over the member RAID 5). Allows two hard disks to fail or being unplugged, but the hard disks must in different array.
RAID 60
(striping over the member RAID 6). Allows four hard disks to fail or being unplugged, but no more than two hard disks in same
array.
JBOD
The abbreviation of “Just a Bunch Of Disks”. No data protection. Data is damaged or inaccessible if any hard disk fails or is
unplugged.
5.2 VG Migration and Expansion
VG Migration/Expansion allow you to change from one RAID level to another, or expand current RAID
level to additional Hard drives. To migrate the RAID level, follow the steps below.
1. Click “/Volume confi g/Volume group”
2. Select the VG to be migrated and click “ ” button in the RAID fi eld
3.
Change the RAID level by clicking the “ ” down list. If the hard disk capacity is not enough
to support the new RAID level, a request to add more PD will pop up. Click “ ”
to add hard disks and click
“ ” to go back to the confi gure page.
When migrating to lower RAID level, such as the migration from RAID 6 to 0, data will be lost. the
system will evaluate if this operation is safe and display the “Sure to migrate to a lower protection
array?” to warn you.
4. Double check the confi guration. If there is no change needed, click “ ”.
5.
A confi rmation page will show detailed RAID data. If there is no change needed, click “ ”
to start the migration.
6.
In the “status 3” fi eld, you can view the migration status and the letter “M” will be displayed. In “/Volume
confi g/User data volume”, a “M” and progress percentage “R%” will be displayed in “Status 3”.
Figure 5.2.1
Remind : To migrate/expand, the total volume of VG must be larger or equal to the original VG. It does not allow the hard
disks with the same RAID level and the same original VG to expand.
When confi guring the migration, if the settings are incorrect, the system will pop up a warning window described as below:
"Invalid VG ID": Source VG error
"Degrade VG not allowed": Source VG is degraded
"Initializing/rebuilding operation's going": Source VG is initialing or rebuilding
"Migration operation's going": Source VG is doing migration
"Invalid VG raidcell parameter": Structural error. For example, the size of a new VG is smaller than that of the original VG
Note : VG migration cannot be executed during data rebuilding or UDV expansion.
SANS DIGITAL
RAID Introduction 51
- EliteRAID 1
- MobileRAID 1
- Forewords 2
- ER104I Quick Install Guide 3
- MR4I Quick Install Guide 5
- Contents 8
- Chapter 1 RAID Introduction 10
- RAID Introduction 11 11
- 2.1 What is iSCSI? 12
- 2.2 Using iSCSI 12
- 2.3 Glossary 13
- Chapter 3 Installation 14
- 3.2 Management Methods 15
- RAID Introduction 16
- RAID Introduction 17 17
- RAID Introduction 19 19
- RAID Introduction 21 21
- 3.3 System Control 22
- 3.3.1 LCM (SL5650) 22
- 3.3.2 System Buzzer 23
- Chapter 4 GUI Overview 24
- 4.2 Login 25
- 4.3 Quick install 26
- 4.4 System confi g 27
- 4.4.1 System name 27
- 4.4.2 IP address 28
- 4.4.3 Language 28
- 4.4.4 Login Confi g 28
- 4.4.5 Password 29
- 4.4.6 Date 29
- 4.4.7 E-Mail 29
- 4.4.9 System log Server 30
- 4.4.10 Event log 30
- 4.5 iSCSI confi g 31
- 4.5.1 Entity property 31
- 4.5.2 NIC 31
- 4.5.3 Node 32
- 4.5.4 Session 32
- 4.5.5 CHAP account 32
- 4.6 Volume confi g 33
- 4.6.1 Physical disk 33
- RAID Introduction 34
- 4.6.2 Volume group (VG) 35
- 4.6.4 Cache volume (CV) 36
- 4.6.5 Logical unit number 37
- 4.6.6 Example 37
- RAID Introduction 39 39
- RAID Introduction 41 41
- RAID Introduction 43 43
- 4.7 Enclosure Management 45
- 4.7.1 SES confi g 45
- 4.7.2 Hardware Monitor 45
- 4.7.4 UPS 46
- 4.8 Maintenance 47
- 4.8.1 Upgrade 47
- 4.8.2 Info 48
- 4.8.3 Reset to default 48
- 4.8.5 Shutdown 48
- 4.9 Logout 49
- Chapter 5 Advanced Operation 50
- RAID Introduction 51 51
- 5.3 UDV Expansion 52
- 5.4 Disk roaming 52
- 6.1 Sharing Resources 53
- 6.3 Remote Access 54
- Appendix 55
- B. Event notifi cations 57
- • System confi g events 58
- • LVM events 58
- RAID Introduction 59 59
- D. Microsoft iSCSI Initiator 61
- Figure D.3 62
- Figure D.4 62
- Figure D.5 63
- Figure D.6 63
- Figure D.7 64
- Figure D.8 65
- C. Click “Log off” 65
- • Network diagram of MPIO 66
- Figure E.1 66
- RAID Introduction 67 67
- SANS DIGITAL 68
- Figure E.8 69
- Figure E.9 69
- Figure E.10 70
- Figure E.11 70
- Figure E.12 71
- • Log on 71
- • Log on again 73
- Figure E.16 73
- Figure E.17 73
- Figure E.18 74
- Figure E.19 75
- Figure E.20 75
- SANS DIGITAL iSCSI 76
- RAID Introduction 77 77
- • Log on 78
- Figure E.25 78
- • Then click “Advanced” 78
- Figure E.26 78
- Then click “OK” 79
- Figure E.27 79
- Figure E.28 80
- Figure E.29 80
- RAID Introduction 81 81
- Figure F.1 82
- Figure F.2 83
- Figure F.3 83
- • Click “OK” 83
- Figure F.4 83
- Figure F.5 84
- RAID Introduction 85 85
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