HP Surestore 125ex Hewlett-Packard SureStore 125ex Optical Jukebox User&#1 - Page 98

Ddressing, Ransfer

Get HP Surestore 125ex - Optical Jukebox PDF manuals and user guides View all HP Surestore 125ex manuals
Add to My Manuals
Save this manual to your list of manuals

Page 98 highlights

B NEXT PREVIOUS OPERATING THIS JUKEBOX ON A SCSI BUS [1] Priority - the order at which contentions on the bus are resolved [2] Narrow Addresses - IDs from 0 to 7 available on a narrow bus [3] Wide Address Range - IDs from 0 to 15 available on a wide bus The following diagram below shows the linear addressing of a simple, narrow bus with the host bus adapter set at a SCSI ID of 7. Seven other target devices are set to the remaining IDs. Note that the ID of the device does not determine where the device is physically placed on the bus. JUMP CONTENTS INDEX [1] Host Bus Adapter - the connecting point for all SCSI devices on the bus LUN ADDRESSING This jukebox does not support logical unit numbering (LUN) addressing. TRANSFER RATES ON THE BUS Initially, the SCSI specification defined a 5 MB/s synchronous data transfer rate on the narrow bus. SCSI now also defines "Fast" which is 10 MB/s on a narrow bus and 20 MB/s on a wide bus. Another definition is "Ultra," also known as "Fast-20" which is 20 MB/s transfer rate on a narrow bus and 40 MB/s on a wide bus. 3

  • 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
B
O
PERATING
T
HIS
J
UKEBOX
ON
A
SCSI B
US
B
3
NEXT
PREVIOUS
JUMP
CONTENTS
INDEX
[1] Priority - the order at which contentions on the bus are resolved
[2] Narrow Addresses - IDs from 0 to 7 available on a narrow bus
[3] Wide Address Range - IDs from 0 to 15 available on a wide bus
The following diagram below shows the linear addressing of a simple, narrow bus with the host bus adapter set at a
SCSI ID of 7. Seven other target devices are set to the remaining IDs. Note that the ID of the device does not determine
where the device is physically placed on the bus.
[1] Host Bus Adapter - the connecting point for all SCSI devices on the bus
LUN A
DDRESSING
This jukebox does not support logical unit numbering (LUN) addressing.
T
RANSFER
R
ATES
ON
THE
B
US
Initially, the SCSI specification defined a 5 MB/s synchronous data transfer rate on the narrow bus. SCSI now also
defines “Fast” which is 10 MB/s on a narrow bus and 20 MB/s on a wide bus. Another definition is “Ultra,” also known
as “Fast-20” which is 20 MB/s transfer rate on a narrow bus and 40 MB/s on a wide bus.