Specifications

1 Enabling Tag Queuing

Tag Queuing is a SCSI-II option implemented by several large SCSI

hard disk drives. It allows a series of commands, sent to the drive

by the host adapter, to be executed in an optimal order and not

necessarily in the order in which they were sent. Normally, the

UNIX SCSI Manager disables Tag Queuing by default because some

drives have non-SCSI-conforming Tag Queuing implementations.

To enable Tag Queuing, follow these steps:

Type the following and press

Enter

to change directories to the

/etc/conf/pack.d/Sdsk directory:

cd /etc/conf/pack.d/Sdsk

Using the vi editor, type the following and press

Enter

to edit

the file space.c. in this directory:

vi space.c

To search for the string Sdsk_no_tag = 0 and replace it with

Sdsk_no_tag = 1, type the following and press

Enter:

:g/tag -

O/s//tag - 1

Type :

and press

Enter

to save the file.

To relink the kernel and enable the new capability, type the

following and press

Enter:

cd /etc/conf/cf.d

./link-unix

Reboot the system to invoke the newly linked kernel.

Installing Software Drivers for UNIX

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