Apc SGI 15000 RAID User Manual Page 84
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communication, such as a cable failure, can cause the controller to fail numerous disk drives. Once the
loss of communication is resolved, the time to rebuild all the failed drives can take many weeks.
The rebuild journals contain bitmaps that indicate which portions of the disks in a tier have been updated
with new data while a disk was failed or replaced. The system uses the information in the journals to
reduce the rebuild time of drives that have not been swapped out. This can dramatically lower rebuild
time, since only portions of the tier may have been updated while the drive was failed or replaced.
The granularity of the journal will be 4MB of data on a single disk or 32MB of host data. Thus a single
host write will force the system to rebuild a minimum of 4MB of data on the disk. A new host write into
a 4MB section that has already been journaled will not cause a new journal entry. The system will
automatically update journals when disks are failed or replaced regardless of whether journaling is
enabled.
To ensure that the journals are correct, the system carefully monitors the state of the journals and will
automatically invalidate or disable the journals if it detects a condition where the journal cannot be used
or journal information could potentially be lost.
The following summarizes the limitations that apply to journaling:
• Rebuild journaling will automatically be disabled if the failed disk is swapped with a new disk. The
system will track the serial number of the disks when they are failed and will force a rebuild of the
entire disk if the serial number changes.
• Rebuild journaling will not be used when a failed disk is replaced by a spare. The rebuild journal
can be used when rebuilding a replaced disk that has not been swapped.
• The system will invalidate the journal on tiers that have failed or replaced disks on boot up. This is
required because the system does not save the journal information.
• Rebuild journaling will be managed by the controller that owns the tier. If a controller is failed, then
the journals on the tiers owned by that controller will be invalidated.
• The system tracks the original owner of a tier when a drive is failed so changing the ownership of
the tier will disable use of the journal for rebuilds on that tier.
• Rebuild journaling will be disabled when rebuilding disks that are failed due to a change in the
parity mode of the tier.
• Use of the rebuild journal will be temporarily disabled if the system is rebuilding a LUN that is a
backup LUN in a mirror group.
- InfiniteStorage 15000 RAID 1
- User’s Guide 1
- COPYRIGHT 2
- Contents 3
- 007-5510-002 i 3
- 007-5510-002 iii 5
- International Standards 7
- Interference 7
- European Regulations 8
- Qualified Personnel 8
- Safe Handling 8
- 007-5510-002 vii 9
- Rack System Precautions 11
- ESD Precautions 12
- Data Security 12
- 007-5510-002 xi 13
- Chapter 1 15
- Introduction 15
- 1.2 The Controller Hardware 16
- Front (behind cover panel) 17
- 4 007-5510-002 18
- 007-5510-002 5 19
- Figure 1–4 Host Port LEDs 20
- 007-5510-002 7 21
- 8 007-5510-002 22
- 007-5510-002 9 23
- Chapter 2 25
- Controller Installation 25
- 2.2 Unpacking the System 26
- Figure 2–1 I/O Connectors 27
- 2.2.6.1 Basic Key Operations 28
- 007-5510-002 15 29
- 2.3.2 Configuration Interface 31
- 2.3.3 Login as Administrator 31
- <Enter> 32
- tier config 33
- 2.3.6.1 Heading Definitions 34
- dual label 35
- 007-5510-002 25 39
- 26 007-5510-002 40
- Chapter 3 43
- Controller Management 43
- Remotely - Telnet 44
- 3.1.3.1 Login 44
- 3.1.3.2 Logout 45
- 3.1.3.3 Password 45
- 3.1.3.4 Who Am I 45
- CLI session: 46
- 15000 [1]: whoami 46
- 3.2.1.2 Host Status 47
- 3.2.1.1 Host ID 47
- Host WWN 47
- 3.2.1.3 Host IB Users 48
- 3.2.1.4 Host Port Speed 48
- Disk and Channel Information 48
- . The tier 49
- 36 007-5510-002 50
- 007-5510-002 37 51
- 3.2.2.1 Tier View 52
- 3.2.2.2 Tier Configuration 53
- 3.2.2.3 LUN View 54
- 3.2.2.4 LUN Configuration 55
- 3.2.2.5 LUN Reservations 55
- 42 007-5510-002 56
- 3.2.4.1 Telnet 57
- 3.2.4.2 SNMP & Syslog 58
- 3.2.5.1 System Restart 59
- 3.2.5.2 System Shutdown 60
- 3.2.6.1 System Date 60
- 3.2.6.2 System Time 61
- 15000 [1]: save 61
- 3.2.9.2 Creating a LUN 62
- 3.2.9.3 Formatting a LUN 63
- 3.2.9.5 Changing a LUN Label 63
- lun label 63
- 3.2.9.7 Deleting a LUN 64
- SCSI Reservations 64
- 3.2.11 SMART Command 65
- 52 007-5510-002 66
- 3.2.12.1 Cache Coherent 67
- Non-Cache Coherent 67
- (Figure 3–28) 68
- 3.3 Performance Management 69
- 3.3.1.1 Cache Segment Size 70
- 3.3.1.3 Prefetch Settings 70
- 3.3.1.4 Cache Settings Reset 71
- Disk Configuration Settings 71
- 58 007-5510-002 72
- 3.3.3 Locking LUN in Cache 73
- 007-5510-002 61 75
- 62 007-5510-002 76
- 100msec intervals 77
- 64 007-5510-002 78
- (Figure 79
- 3.3.4 Resources Allocation 80
- 007-5510-002 67 81
- 68 007-5510-002 82
- 3.3.4.3 Rebuild Journaling 83
- 70 007-5510-002 84
- 15000 [1]: ses m_wait 85
- SES timer m_wait = 6 seconds 85
- 3.3.4.5 Host Command Timeout 86
- 3.4.1 Monitoring User Logins 87
- 3.4.3 User Authentication 88
- 007-5510-002 75 89
- 3.6 Remote Login Management 90
- 15000 [1]: 91
- (Figure 3–57). The 92
- 3.7 System Logs 93
- 80 007-5510-002 94
- 15000 [1]: apc_ups 95
- 15000 [1]: api 95
- 3.8.5 Disk Diagnostics 96
- 3.8.7 SPARE Commands 97
- 84 007-5510-002 98
- Chapter 4 99
- (Figure 4–3) 100
- Troubleshooting 101
- 007-5510-002 87 101
- 88 007-5510-002 102
- 4.1.4.2 Traps 103
- 4.2.1.1 Power Supply Failure 103
- 4.2.1.2 Fan Failure 104
- 007-5510-002 91 105
- 92 007-5510-002 106
- 007-5510-002 93 107
- (Figure 4–7) 108
- Chapter 5 109
- Drive Enclosure System 109
- 5.2 Enclosure Core Product 110
- 5.3 The Plug-in Modules 111
- Table 5–1 PCM LEDs 112
- Figure 5–5 I/O Module 113
- Table 5–2 I/O Module LEDs 113
- 5.3.4 DEM Card 114
- 5.4 Indicators 115
- Table 5–3 Display Panel LEDs 116
- Audible Alarm 116
- 5.4.2 Internal Indicators 118
- 5.6.1 Dimensions 119
- 5.6.2 Weight 120
- 5.6.3 AC INPUT PCM 120
- 5.6.4 DC INPUT PCM 120
- 5.7 Environment 121
- Chapter 6 123
- Drive Enclosure Installation 123
- 110 007-5510-002 124
- 007-5510-002 111 125
- 6.4.1 Controller Options 126
- 6.5 SAS DEM 127
- 6.6 SATA Interposer Features 127
- 6.8 Grounding Checks 127
- Chapter 7 129
- Drive Enclosure Operation 129
- 7.2.2 I/O Panel LEDs 130
- Chapter 8 131
- 8.3 LEDs 132
- 8.3.4 I/O Module 133
- 120 007-5510-002 134
- 8.4 Audible Alarm 135
- 8.5 Troubleshooting 135
- Symptom Cause Action 136
- 8.5.2 Thermal Alarm 137
- 8.5.3 Thermal Shutdown 137
- 8.8 Replacing a Module 138
- 007-5510-002 125 139
- 8.8.2 I/O Module 140
- 8.9 Replacing the DEM 141
- 007-5510-002 143
- Drive Addressing 145
- 007-5510-002 152
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