HP SW TL881 DLT Mini-Lib/1 Compaq StorageWorks TL881/TL891 Family MiniLibrary - Page 73

Internal Cabling Configuration, Bus Length Limitations, Physical Configuration, System Expansion

Page 73 highlights

2-40 Compaq StorageWorks TL881/TL891 Family MiniLibrary System Reference Guide Internal Cabling Configuration The differential MiniLibrary system is wired in an independent-bus SCSI configuration; the robotics and each of the drives has its own SCSI bus. SCSI jumpers are available for those applications requiring that some combination of drives and robotics are daisy-chained to a single SCSI bus. The single-ended table-top unit has the robotics and first DLT drive daisy- chained internally to shorten the total internal cable length. The second drive is on an independent bus. Bus Length Limitations The single-ended SCSI-2 bus is limited to 19 ft (6 m) in length; single-ended fast SCSI-2 bus is limited to 10 ft (3 m) overall length. LVD SCSI bus length is 39 ft (12 m). In contrast, differential SCSI-2 and fast SCSI-2 buses can be up to 82 ft (25 m) long. Physical Configuration All modules in a MiniLibrary system must be mounted in a rack except for the table top module version. When a system is ordered, all the modules are supplied in a rack-mount configuration. Modules cannot be operated alone except for the MiniLibrary Base Module, which can be converted to operate as a free-standing 10-slot library. System Expansion A DLT MiniLibrary system can be expanded in capacity or performance or both by adding or removing components. Associated with each component is a section of the PTM. The MiniLibrary storage system firmware integrates the robotics in the individual modules and the Expansion Unit PTM into a single high-performance library robotics system. Free-Standing MiniLibrary Base Modules Conversion You can add existing MiniLibrary Base Modules to your system by changing firmware, resetting internal jumpers, removing the pass-through cover plate, and in some cases converting from desktop to rackmount. These tasks should be performed by qualified service personnel. Contact your technical support representative for instructions.

  • 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
  • 143
  • 144
  • 145
  • 146
  • 147
  • 148
  • 149
  • 150
  • 151
  • 152
  • 153
  • 154
  • 155
  • 156
  • 157
  • 158
  • 159
  • 160
  • 161
  • 162
  • 163
  • 164
  • 165
  • 166
  • 167
  • 168
  • 169
  • 170
  • 171
  • 172
  • 173
  • 174
  • 175
  • 176
  • 177
  • 178
  • 179
  • 180
  • 181
  • 182
  • 183
  • 184
  • 185
  • 186
  • 187
  • 188
  • 189
  • 190
  • 191
  • 192
  • 193
  • 194
  • 195
  • 196
  • 197
  • 198
  • 199
  • 200
  • 201
  • 202
  • 203
  • 204
  • 205
  • 206
  • 207
  • 208
  • 209
  • 210
  • 211
  • 212
  • 213

2-40
Compaq StorageWorks TL881/TL891 Family MiniLibrary System Reference Guide
Internal Cabling Configuration
The differential MiniLibrary system is wired in an independent-bus SCSI
configuration; the robotics and each of the drives has its own SCSI bus. SCSI
jumpers are available for those applications requiring that some combination
of drives and robotics are daisy-chained to a single SCSI bus.
The single-ended table-top unit has the robotics and first DLT drive
daisy- chained internally to shorten the total internal cable length. The second
drive is on an independent bus.
Bus Length Limitations
The single-ended SCSI-2 bus is limited to 19 ft (6 m) in length; single-ended
fast SCSI-2 bus is limited to 10 ft (3 m) overall length. LVD SCSI bus length
is 39 ft (12 m).
In contrast, differential SCSI-2 and fast SCSI-2 buses can be
up to 82 ft (25 m) long.
Physical Configuration
All modules in a MiniLibrary system must be mounted in a rack except for the
table top module version. When a system is ordered, all the modules are
supplied in a rack-mount configuration. Modules cannot be operated alone
except for the MiniLibrary Base Module, which can be converted to operate as
a free-standing 10-slot library.
System Expansion
A DLT MiniLibrary system can be expanded in capacity or performance or
both by adding or removing components. Associated with each component is a
section of the PTM. The MiniLibrary storage system firmware integrates the
robotics in the individual modules and the Expansion Unit PTM into a single
high-performance library robotics system.
Free-Standing MiniLibrary Base Modules
Conversion
You can add existing MiniLibrary Base Modules to your system by changing
firmware, resetting internal jumpers, removing the pass-through cover plate,
and in some cases converting from desktop to rackmount. These tasks should
be performed by qualified service personnel. Contact your technical support
representative for instructions.