Fujitsu MAB3091SC Product Manual - Page 101

Refer to of SCSI Logical Interface Specifications for further details.

Get Fujitsu MAB3091SC - Enterprise 9.1 GB Hard Drive PDF manuals and user guides View all Fujitsu MAB3091SC manuals
Add to My Manuals
Save this manual to your list of manuals

Page 101 highlights

Notes: 1. The user can arbitrarily specify the following parameters according to the system requirements: • ARRE • TB • PER 2. The user also can arbitrarily specify parameters other than the above. However, it is recommended to use the default setting in normal operations. (2) Disconnection/reconnection parameters (page code = 2) The following parameters are used to optimize the start timing of reconnection processing to transfer data on the SCSI bus at a read (READ or READ EXTENDED command) or write operation (WRITE, WRITE EXTENDED, or WRITE AND VERIFY command) of the disk. Refer to Chapter 2 of SCSI Logical Interface Specifications for further details. a. Disconnection/reconnection parameters (page code = 2) • Buffer full ratio • Buffer empty ratio Parameter Default value 20 (HEX) 20 (HEX) Notes: 1. In a system without the disconnection function, these parameters need not be specified. 2. Determine the parameter values in consideration of the following performance factors of the system: • Time required for reconnection processing • Average data transfer rate of the SCSI bus • Average amount of processing data specified with a command Refer to Chapter 2 of SCSI Logical Interface Specifications for how to obtain the rough calculation values for the parameter values to be set. It is recommended to evaluate the validity of the specified values by measuring performance in an operation status under the average system load requirements. 5 - 22 C141-E035-02EN

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
  • 140
  • 141
  • 142
C141-E035-02EN
5 - 22
Notes:
1.
The user can arbitrarily specify the following parameters according to the system
requirements:
•
ARRE
•
TB
•
PER
2.
The user also can arbitrarily specify parameters other than the above.
However, it is
recommended to use the default setting in normal operations.
(2)
Disconnection/reconnection parameters (page code = 2)
The following parameters are used to optimize the start timing of reconnection processing to
transfer data on the SCSI bus at a read (READ or READ EXTENDED command) or write
operation (WRITE, WRITE EXTENDED, or WRITE AND VERIFY command) of the disk.
Refer to Chapter 2 of SCSI Logical Interface Specifications for further details.
a.
Disconnection/reconnection parameters (page code = 2)
Parameter
Default value
• Buffer full ratio
20 (HEX)
• Buffer empty ratio
20 (HEX)
Notes:
1.
In a system without the disconnection function, these parameters need not be
specified.
2.
Determine the parameter values in consideration of the following performance factors
of the system:
•
Time required for reconnection processing
•
Average data transfer rate of the SCSI bus
•
Average amount of processing data specified with a command
Refer to Chapter 2 of SCSI Logical Interface Specifications for how to obtain the
rough calculation values for the parameter values to be set.
It is recommended to
evaluate the validity of the specified values by measuring performance in an operation
status under the average system load requirements.