IBM 8646 Hardware Maintenance Manual - Page 80

SCSI port, SCSI cabling requirements, Setting SCSI IDs, External SCSI devices

Get IBM 8646 - Eserver xSeries 220 PDF manuals and user guides View all IBM 8646 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 80 highlights

SCSI port The server has an integrated small computer system interface (SCSI) controller with an internal connector (J41) on the system board. This controller supports an Ultra160 SCSI internal channel. This channel supports up to 15 SCSI devices. In addition, this controller uses: v Double-transition clocking to achieve high transfer rates v Domain name validation to negotiate compatible data transfer speeds with each device v Cyclic-redundancy checking (CRC), instead of the usual parity checking, to significantly improve data reliability v An active terminator on the system board for SCSI bus termination If you install a SCSI adapter in the server, you can use its SCSI connector to connect different types of small computer system interface (SCSI) devices. Note: If you install a PCI redundant array of independent disks (RAID) adapter, you can move the SCSI cable from the system-board SCSI connector to an internal channel connector on the RAID adapter if you want to control the internal drives from the adapter. SCSI cabling requirements A SCSI cable comes with the server so that you can connect internal SCSI devices to the SCSI controller on the system board. A SCSI cable comes with the models that have the hot-swap drive cage option. If you plan to attach external SCSI devices, you must install an optional SCSI adapter and order additional SCSI cables. For information about the maximum length of SCSI cable between the terminated ends of the cable, refer to the American National Standards Institute (ANSI) SCSI standards. Adhering to these standards will help ensure that your server operates properly. Setting SCSI IDs Each SCSI device that is connected to a SCSI controller or adapter must have a unique SCSI ID. This ID enables the SCSI controller or adapter to identify the device and ensure that different devices on the same SCSI channel do not attempt to transfer data simultaneously. SCSI devices that are connected to different SCSI channels can have duplicate SCSI IDs. SCSI IDs for hot-swap drives are automatically set by the hot-swap backplane. For hot-swap drives, bay 7 has ID 0, bay 6 has ID 1, bay 5 has ID 2. For non-hot-swap drives, refer to the information that comes with the drives for instructions to set their SCSI IDs. External SCSI devices To install external SCSI devices, you must first install an optional SCSI PCI adapter. Refer to the information that is provided with the device for instructions to set its SCSI ID. SCSI connector pin-number assignments The following table shows the pin-number assignments for the 68-pin SCSI connectors. 34 1 68 35 72 Hardware Maintenance Manual: xSeries 220 Type 8646

  • 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
SCSI port
The server has an integrated small computer system interface (SCSI) controller
with an internal connector (J41) on the system board. This controller supports an
Ultra160 SCSI internal channel. This channel supports up to 15 SCSI devices. In
addition, this controller uses:
v
Double-transition clocking to achieve high transfer rates
v
Domain name validation to negotiate compatible data transfer speeds with each
device
v
Cyclic-redundancy checking (CRC), instead of the usual parity checking, to
significantly improve data reliability
v
An active terminator on the system board for SCSI bus termination
If you install a SCSI adapter in the server, you can use its SCSI connector to
connect different types of small computer system interface (SCSI) devices.
Note:
If you install a PCI redundant array of independent disks (RAID) adapter,
you can move the SCSI cable from the system-board SCSI connector to an
internal channel connector on the RAID adapter if you want to control the
internal drives from the adapter.
SCSI cabling requirements
A SCSI cable comes with the server so that you can connect internal SCSI devices
to the SCSI controller on the system board. A SCSI cable comes with the models
that have the hot-swap drive cage option. If you plan to attach external SCSI
devices, you must install an optional SCSI adapter and order additional SCSI
cables.
For information about the maximum length of SCSI cable between the terminated
ends of the cable, refer to the American National Standards Institute (ANSI) SCSI
standards. Adhering to these standards will help ensure that your server operates
properly.
Setting SCSI IDs
Each SCSI device that is connected to a SCSI controller or adapter must have a
unique SCSI ID. This ID enables the SCSI controller or adapter to identify the
device and ensure that different devices on the same SCSI channel do not attempt
to transfer data simultaneously. SCSI devices that are connected to different SCSI
channels can have duplicate SCSI IDs. SCSI IDs for hot-swap drives are
automatically set by the hot-swap backplane. For hot-swap drives, bay 7 has ID 0,
bay 6 has ID 1, bay 5 has ID 2. For non-hot-swap drives, refer to the information
that comes with the drives for instructions to set their SCSI IDs.
External SCSI devices
To install external SCSI devices, you must first install an optional SCSI PCI
adapter. Refer to the information that is provided with the device for instructions
to set its SCSI ID.
SCSI connector pin-number assignments
The following table shows the pin-number assignments for the 68-pin SCSI
connectors.
34
1
68
35
72
Hardware Maintenance Manual: xSeries 220 Type 8646