Apc SGI 15000 RAID User Manual Page 71
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Controller Management
007-5510-002 57
If the MF (Multiplication Factor) parameter is OFF, the system will only prefetch the number of blocks
specified by PREFETCH after every read command. If the MF parameter is ON, then the system will
multiply the transfer length of the command by the prefetch value to determine how much data will be
prefetched. A prefetch value of less than 8 is recommended when the MF parameter is ON.
CACHE MF=ON|OFF enables/disables the MF bit on the specified LUN. Default is ON.
The Maximum Prefetch Ceiling parameter sets the maximum prefetch ceiling in blocks for prefetches
on read commands. It sets an upper limit on prefetching when the MF parameter is ON. The system will
automatically limit the amount of prefetching if the system is running low on resources.
CACHE MAX=x (where X is a range from 0...65535) sets the maximum prefetch ceiling in blocks for
prefetches on Read commands for the specified LUN. Valid range is 0 to 65535. Default setting is 65535.
3.3.1.4 Cache Settings Reset
CACHE DEFAULTS loads the default settings for all of the cache parameters for the specified LUNs.
Disk Configuration Settings
The DISK command displays the current disk configuration settings (Figure 3–30).
Figure 3–30 Disk Configuration Setting Screen
The writeback cache and disk timeout settings can be configured manually.
DISK TIMEOUT=x sets the disk timeout for an I/O request in seconds. Valid range is 1 to 512 seconds.
Default setting is 68 seconds.
DISK CMD_TIMEOUT=x sets the Retry Disk timeout (in seconds) for an I/O request. The retry timeout
value indicates the maximum amount of time that is allotted to receive a reply for each retry of an I/O
request. If the I/O request does not complete within this time, it is aborted and potentially retried: if there
is still time remaining in the overall disk timeout to allow for another retry, it is retried; if not, it
completes with an error status.
NOTE :
The DISK CMD_TIMEOUT value must be smaller than or equal to DISK TIMEOUT.
Valid range is 1 to 512 seconds.
- 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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