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Enable Disconnection
This option is used to determine whether or not the host adapter
will allow a SCSI device to disconnect from the SCSI bus (some-
times referred to as disconnect/reconnect). This allows the host
adapter to perform other operations on the SCSI bus while the
SCSI device is temporarily disconnected.
When set to yes, the SCSI device may disconnect from the SCSI
bus. The SCSI device, however, may choose not to disconnect,
even if allowed to by the host adapter (this is usually configurable
on the SCSI device). When set to no, the SCSI device will not be
allowed to disconnect from the SCSI bus. The default setting is
yes.
In general, disconnect should be allowed for the most efficient
SCSI bus utilization and highest overall system performance. If
only one SCSI device is attached to the SCSI host adapter, discon-
nects are not required for efficient SCSI bus utilization since only
one SCSI device is using the SCSI bus. A slight performance
increase may be realized if disconnect is not allowed in this case,
due to the decreased SCSI overhead. In multi-device environ-
ments, disconnect should normally be enabled to take advantage
of the disconnect/reconnect feature.
If a particular SCSI device does not support disconnect/reconnect,
then Enable Disconnection should be disabled (set to no). If a
particular SCSI device does support disconnect/reconnect, then
Enable Disconnection should be enabled (set to yes). Most SCSI
devices today do support disconnect/reconnect.
Configuration Setting for SCSI Devices (1x8)
Channel A Device ID
Enable Disconnection
Initiate Sync Negotiation
Maximum Sync Xfer Rate
Include in BIOS Scan
Error if Device Not Found
Send Start Unit Command
OK <ESC> <DEFAULT>
#0
yes
yes
10.0
yes
no
no
#1
yes
yes
10.0
yes
no
no
#2
yes
yes
10.0
yes
no
no
#3
yes
yes
10.0
yes
no
no
#4
yes
yes
10.0
yes
no
no
#5
yes
yes
10.0
yes
no
no
#6
yes
yes
10.0
yes
no
no
#7
yes
yes
10.0
yes
no
no
Figure 3-13. SCSI Device Configuration
Adaptec AHA-2740 Series User’s Manual
Stock Number: 510381-00 / Rev. C (Page 3-15)
Print Spec Number: 491709-00 Rev C
Current Date: 9/1/93 ECN Date: 9/14/93
Configuring the Host Adapter
3-15
- User’s Manual 1
- Adaptec, Inc 2
- Copyright 4
- Trademarks 4
- FCC Compliance Statement 5
- List of Figures 10
- List of Tables 11
- Inside This Manual 13
- Conventions 14
- Advisories 15
- Introduction 18
- Overview 20
- Features 21
- Fully Disk Array Capable 22
- Board Layout 23
- Default Settings 24
- Unpacking and Inspection 25
- Adaptec Technical Support 26
- Getting Started 28
- Installation Overview 30
- Quick Installation 32
- Configure the Host Adapter 34
- Installation 35
- SCSI ID Setting 39
- Board Installation 40
- LED CONNECTOR 41
- LED CABLE 41
- Connecting Peripherals 42
- EXTERNAL SCSI 47
- DISKETTE DRIVE 49
- Before Re-booting Your System 50
- Reassemble the System 50
- Select the Host Adapter 55
- SCSI Channel A Configuration 61
- SCSI Bus Parity Check 61
- ( ) Enabled 61
- ( ) Disabled 61
- SCSI Bus Reset at Power-on 62
- BIOS and Device Configuration 63
- Support More than Two Drives 65
- Enable Disconnection 66
- Initiate Sync Negotiation 67
- Maximum Synch Xfer Rate 67
- Include in BIOS Scan 68
- Error if Device Not Found 69
- Send Start Unit Command 69
- <ESC> 70
- ( ) Disk Format Utility 71
- Problems and Solutions 77
- When I tried to use the 78
- Conflicts With Other Options 80
- Technical Information 84
- Product Specifications 84
- Interface 85
- SCSI Interface 85
- AHA-2740 Series User’s Manual 87
- Floppy Disk Interface 89
- Host Adapter Support 92
- Performance Tips 96
- Enabling SCSI Bus Parity 97
- Setting Enable Disconnection 97
- DOS/Windows Performance 98
- Disk Drives Over 1 Gigabyte 100
- The DOS 1 Gigabyte Limit 102
- With DOS Version 5 Only 103
- Drives With Mixed Partitions 103
- Using Fdisk 103
- Translation 104
- Glossary 106
- Table of Contents 128
- Configuring the Host Adapter 129
- Troubleshooting 129
- APPENDICES 129
- Specifications 129
- I/O Operating Environment 130
- Optimizing Performance 130
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