HP Tc2120 HP Server Ultra 3 SCSI Host Bus Adapter Installation and Configurati - Page 57

Optimizing Performance, cd device list, cd mount, max_tags

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Chapter 5 Novell NetWare Installation 2. The scsicd.cdm driver will auto-load if the device(s) are detected. NOTE For multiple LUN CDs, enable multiple LUN scanning with the lun_enable switch (e.g., load adpt160m lun_enable=FF). The lun_enable switch is needed for adpt160m.ham. Enter the following line at the prompt: scan all luns 3. Enter the following line at the prompt and then note the number and name of the CD: :cd device list 4. Enter the number or volume name of the CD at the command line: :cd mount [x] [name] 5. Edit the startup.ncf file to include the load commands in Step 1 and Step 2 above, if auto-mounting devices. 6. Edit the driver load command in the startup.ncf file to include the slot number (for example, load c:\server.312\adpt160m slot=2). Optimizing Performance The HP Ultra3 SCSI Bus Master firmware increases the SCSI performance of the HP Ultra3 host adapters under multitasking environments. The firmware uses a paging mechanism to handle up to 255 simultaneous SCSI commands. The sequencer can simultaneously manage up to 128 tagged, or 1 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 feature, enter the following command: max_tags=n In general, a low number of max_tags gives better sequential performance, and a high number a better random performance. NOTE A large number of max_tags can also cause starvation problems leading to deactivation with some drives. 51

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51
Chapter 5
Novell NetWare Installation
2.
The scsicd.cdm driver will auto-load if the device(s) are detected.
3.
Enter the following line at the prompt and then note the number and name of the
CD:
:cd device list
4.
Enter the number or volume name of the CD at the command line:
:cd mount
[x] [name]
5.
Edit the startup.ncf file to include the load commands in
Step 1
and
Step 2
above, if auto-mounting devices.
6.
Edit the driver load command in the startup.ncf file to include the slot number
(for example,
load c:\server.312\adpt160m slot=2
).
Optimizing Performance
The HP Ultra3 SCSI Bus Master firmware increases the SCSI performance of the
HP Ultra3 host adapters under multitasking environments. The firmware uses a
paging mechanism to handle up to 255 simultaneous SCSI commands. The
sequencer can simultaneously manage up to 128 tagged, or 1 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 feature, enter the following command:
max_tags=
n
In general, a low number of max_tags gives better sequential performance, and a
high number a better random performance.
NOTE
For multiple LUN CDs, enable multiple LUN scanning with
the lun_enable switch (e.g., load adpt160m lun_enable=FF).
The lun_enable switch is needed for
<File
Name>
adpt160m.ham.
Enter the following line at the prompt:
scan all luns
NOTE
A large number of max_tags can also cause starvation
problems leading to deactivation with some drives.