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Chapter 5 Advanced Operation
5.1 Rebuild
When A Volume Group (VG) is protected by RAID level (e.g.: RAID 3, RAID 5, or RAID 6), if one
physical disk has been failed, unplugged or removed, the VG status is changed to rebuild. The system
will search for available space to rebuild the data to ensure data integrity. It will use the dedicated spare
disk as rebuild disk fi rst, then the global spare disk.
Sans Digital iSCSI Series Products support the Auto-Rebuild function. When the RAID level degraded or
fail, Sans Digital iSCSI Series Products start Rebuild automatically.
For example, if a RAID 6 is setup:
1. When there is no global spare disk or dedicated spare disk on the system, Sans Digital iSCSI Series
Products will be in degraded mode and wait until
(A) one hard disk is assigned as spare hard disk,
(B) the failed hard disk is replaced with new clean hard disk.
An Auto-Rebuild process will starts automatically when either of the above occur. The new disk will
be a spare disk to the original VG .
If the new added hard disk is not clean (with unknown VG information), it would be marked as
RS (reserved) and the system will not start the Auto-Rebuild.
If the disk is belonging to existing VG, it would be FR (Free) disk and the system will start
Auto-Rebuild.
2. When there is enough global spare disk(s) or dedicated spare disk(s), Sans Digital iSCSI Series
Products will start Auto-Rebuild immediately. In RAID 6 level, if there is another disk failure
during the
rebuilding process, Sans Digital iSCSI Series Products will complete the rebuild regardless. The
Auto-Rebuild feature works at realtime to prevent a confl ict with the “Roaming” function.
In degraded mode, the status of VG is “DG”.
When rebuilding, the status of PD/VG/UDV will display “R”, and “R%” in UDV will display rebuild status
in percentage. After rebuilding is complete, “R” and “DG” will disappear. And the VG will back to normal.
Note : If there is no VG or only the VG under RAID 0 or JBOD mode, rebuild is not avaliable.
Sometimes "Rebuild" is also known as "Recover". The following table describes the relationship between
RAID levels and rebuilding.
RAID 0
(striping). No data protection. Data is damaged or inaccessible if any hard disk fails or is unplugged.
RAID 1
(mirroring). Allows one hard disk to fail or being unplugged. One new hard disk is required to insert to the system to complete
the rebuilding.
N-way mirror
Extension of RAID 1 level. It has N copies of the disks and allows N-1 hard disks to fail or being unplugged.
RAID 3
(striping with parity). Allows one hard disk to fail or being unplugged.
50 RAID Introduction
- 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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