Apc SGI 15000 RAID User Manual Page 74
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For example, LUNs 0 to 3 are locked in cache and all 50% of the total cache has been filled by data from
LUN 0, 1, and 2.
When a host issues a read command for data from LUN 3, the following will occur:
• The controller unit determines which data to remove from the locked portion of cache, using the
LRU algorithm. The LRU algorithm is thus: If LUN 0 has not been accessed for 1 hour, LUN 1
has not been accessed for 30 minutes, and LUN 2 has not been accessed for 2 minutes, then
LUN 0’s data will be removed from cache because it is the least recently used data.
• The controller reads data from disks, locks data in cache, sends data to host.
• Any reads of same data will be serviced from cache (until data is removed from cache due to its
being the least recently used data).
3.3.3.1 Locking / Unlocking a LUN
To lock a LUN in the data cache, enter:
LUN LOCK=X
<Enter>
where “X” is the Logical Unit number <0..1023> (Figure 3–32
).
Figure 3–32 Logical Unit Status - LUN Locked in Cache
LUN UNLOCK=x unlocks a LUN and releases its cache locked by the LUN.
3.3.3.2 System Performance Statistics
The controller monitors pre-fetch and cache efficiency, request distribution, transaction, and transfer
rates by port.
The STATS command displays the Performance Statistics for the host ports, disk channels, and cache
memory (Figure 3–33
). It will show the read and write performance of each of the host ports.
Unlocked LUN data
Data for
LUN 2
Initial Cache
Data for
LUN 0
Data for
LUN 1
Cache allocation after I/O completes
Unlocked LUN data
Data for
LUN 2
Data for
LUN 3
Data for
LUN 1
Logical Unit Status
Block
Size
LUN Tiers Tier ListCapacity
(Mbytes)
512
-------------------------------------------------------------------------
10002Cache Locked0
System Capacity 277810 Mbytes, 237802 Mbytes available.
Status
3 1 2 3
51210002Ready1 3 1 2 3
51210002Ready2 3 1 2 3
51210002Ready3 3 1 2 3
15000 [1]: lun lock=0
Owner
1
1
1
1
Label
- 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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