Dell PowerEdge 4300 Dell PowerEdge 4300 Systems User's Guide - Page 44

Boot LUN Number, Multiple LUN Support, SCSI Device/Configuration Settings, Initiate Sync Negotiation

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location on the backplane board for the SCSI ID of each drive location. The default for Boot Target ID is 0. Boot LUN Number - If your boot device has multiple logical unit numbers (LUNs) and Multiple LUN Support is enabled (see "Advanced Host Adapter Settings" found later in this section), this option allows you to specify a particular LUN from which to boot on your boot device. The default is 0. SCSI Device/Configuration Settings allows you to configure certain parameters for each device on the SCSI bus. To configure a specific device, you must know the SCSI ID assigned to that device. If you are not sure of the SCSI ID, see "SCSI Disk Utilities" found earlier in this section. Initiate Sync Negotiation - This option determines whether the host adapter initiates synchronous data transfer negotiation (sync negotiation) between itself and the device. The default is Yes. Sync negotiation is a SCSI feature that allows the host adapter and its attached SCSI devices to transfer data in synchronous mode. Synchronous data transfer is faster than asynchronous data transfer. The host adapter always responds to sync negotiation if the SCSI device initiates it. If neither the host adapter nor the SCSI device initiates sync negotiation, data is transferred asynchronously. Normally, you should leave Initiate Sync Negotiation enabled (a setting of Yes), because most SCSI devices support sync negotiation and because it allows for faster data transfer. NOTE: Some older SCSI-1 devices do not support sync negotiation. This may cause your computer to operate erratically or hang if Initiate Sync Negotiation is set to Yes. Set Initiate Sync Negotiation to No for these devices. Maximum Sync Transfer Rate (MB/sec) - This option sets the maximum synchronous data transfer rate that the host adapter supports. The host adapter supports rates up to 80 megabytes per second (MB/sec). The default for the Adaptec AIC-7860 host adapter is 20; the default for the AIC-7890 and 2940U2W host adapters is 80. If the host adapter is set so that it does not negotiate for synchronous data transfer, the maximum synchronous transfer rate is the maximum rate that the host adapter accepts from the device during negotiation. (This is standard SCSI protocol.) Enable Disconnection - This option (sometimes called disconnect/reconnect) determines whether the host adapter allows the SCSI device to disconnect from the SCSI bus. Enabling disconnection allows the host adapter to perform other operations on the SCSI bus while the SCSI device is temporarily disconnected. The default is Yes. Leave Enable Disconnection set to Yes if two or more SCSI devices are connected to the host adapter. This optimizes SCSI bus performance. If only one 3-6 Dell PowerEdge 4300 Systems User's Guide

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3-6
Dell PowerEdge 4300 Systems User’s Guide
location on the backplane board for the SCSI ID of each drive location. The default
for Boot Target ID is
0
.
²
Boot LUN Number
— If your boot device has multiple logical unit numbers
(LUNs) and
Multiple LUN Support
is enabled (see “Advanced Host Adapter Set-
tings” found later in this section), this option allows you to specify a particular
LUN from which to boot on your boot device. The default is
0
.
6&6,±’HYLFH»&RQILJXUDWLRQ±6HWWLQJV
SCSI Device/Configuration Settings
allows you to configure certain parameters for
each device on the SCSI bus. To configure a specific device, you must know the SCSI
ID assigned to that device. If you are not sure of the SCSI ID, see “SCSI Disk Utilities”
found earlier in this section.
²
Initiate Sync Negotiation
— This option determines whether the host adapter
initiates synchronous data transfer negotiation (sync negotiation) between itself
and the device. The default is
Yes
.
Sync negotiation is a SCSI feature that allows the host adapter and its attached
SCSI devices to transfer data in synchronous mode. Synchronous data transfer is
faster than asynchronous data transfer.
The host adapter always responds to sync negotiation if the SCSI device initiates
it. If neither the host adapter nor the SCSI device initiates sync negotiation, data
is transferred asynchronously.
Normally, you should leave
Initiate Sync Negotiation
enabled (a setting of
Yes
),
because most SCSI devices support sync negotiation and because it allows for
faster data transfer.
NOTE: Some older SCSI-1 devices do not support sync negotiation. This may
cause your computer to operate erratically or hang if
Initiate Sync Negotiation
is set to
Yes
. Set
Initiate Sync Negotiation
to
No
for these devices.
²
Maximum Sync Transfer Rate (MB/sec)
— This option sets the maximum syn-
chronous data transfer rate that the host adapter supports. The host adapter
supports rates up to 80 megabytes per second (MB/sec). The default for the
Adaptec AIC-7860 host adapter is
20
; the default for the AIC-7890 and 2940U2W
host adapters is
80
.
If the host adapter is set so that it does not negotiate for synchronous data trans-
fer, the maximum synchronous transfer rate is the maximum rate that the host
adapter accepts from the device during negotiation. (This is standard SCSI
protocol.)
²
Enable Disconnection
— This option (sometimes called
disconnect/reconnect
)
determines whether the host adapter allows the SCSI device to disconnect from
the SCSI bus. Enabling disconnection allows the host adapter to perform other
operations on the SCSI bus while the SCSI device is temporarily disconnected.
The default is
Yes
.
Leave
Enable Disconnection
set to
Yes
if two or more SCSI devices are con-
nected to the host adapter. This optimizes SCSI bus performance. If only one