3-16 Dell PowerEdge 2200 Systems User’s Guide
Optimizing Performance
The Adaptec 78xx SCSI bus master firmware increases the
SCSI performance of the Adaptec 78xx Family host adapt-
ers under multitasking environments. The firmware uses a
paging mechanism to handle up to 255 simultaneous SCSI
commands. The sequencer can simultaneously manage up
to 32 tagged, or 2 nontagged, SCSI commands for each
SCSI device, up to a limit of 255 SCSI commands. The
firmware can queue as many commands as the operating
system is able to send to the host adapter. To set this fea-
ture, enter the following command:
max_tags=
n
In general, a low number for the max_tags option gives
better sequential performance. This value varies with the
level of random disk accesses and drive characteristics.
NOTE: A large value for
max_tags can cause starvation
problems with some drives.
Troubleshooting for NetWare
Any error that occurs while the driver is initializing pre-
vents it from loading. If an error does occur, the driver
causes the computer to beep and then display a numbered
error message:
xxx
message
The xxx indicates the error code, and message is a
descriptive line describing the error. The error codes are
divided into three categories:
000-099: Nonhost adapters
100-299: Host adapters
300-999: Reserved
Specific error codes appear only if you have installed the
host adapters and drivers that generate them.
Nonhost Adapters
000 Failed ParseDriverParameters call
A call to NetWare’s ParseDriverParameters routine has
failed for some unknown reason. The command line con-
tains errors, or you pressed <Esc> at the port or slot prompt.
001 Unable to reserve hardware, possible
conflict
The driver failed in its attempt to reserve the host
adapter’s hardware settings (that is, direct memory access
[DMA] and interrupt request [IRQ] settings). Another
card in your system may be causing a conflict with the
host adapter.
002 NetWare rejected card Failed AddDisk-
System call
The driver failed in its attempt to register the host adapter
with NetWare. The file server may not have enough
memory.
003 Invalid command line option entered >
option
An invalid option was entered on the command line. The
invalid option that was entered is also displayed.
004 Invalid command line, please enter
correctly
The driver was unable to understand the command line
options you entered. Be sure you have entered these
options correctly.
Host Adapters
200 No host adapter found for this driver
to register
No Adaptec 78xx host adapter was found in your com-
puter for the driver to register. Be sure the host adapter is
properly configured and properly seated in the slot.
203 Invalid ‘device’ setting
You have entered an invalid slot setting on the command
line. You can only enter slot numbers for valid host
adapters. If you load without the slot option, you will be
prompted to enter a valid value.
204 Invalid ‘verbose’ setting, use ‘y’
You can only enter
y
for this option (verbose = y).
205 Invalid ‘removable’ setting, use ‘off’
You can only enter
off
for this option (removable = off).
206 Invalid ‘fixed_disk’ setting, use ‘off’
You can only enter
off
for this option (fixed_disk = off).
208 SCSI present but not enabled/configured
for PCI
A host adapter is present, but its bus or device entry has
not been enabled.
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