SCSA defines a global variable, scsi_options, which can be used for debug and control. The defined bits in scsi_options can be found in the file <sys/scsi/conf/autoconf.h>. Table 14-2 shows their meanings when set.
Table 14-2 SCSA Options
Option |
Description |
---|---|
SCSI_OPTIONS_DR |
Enables global disconnect/reconnect. |
SCSI_OPTIONS_SYNC |
Enables global synchronous transfer capability. |
SCSI_OPTIONS_LINK |
Enables global link support. |
SCSI_OPTIONS_PARITY |
Enables global parity support. |
SCSI_OPTIONS_TAG |
Enables global tagged queuing support. |
SCSI_OPTIONS_FAST |
Enables global FAST SCSI support: 10MB/sec transfers, as opposed to 5 MB/sec. |
SCSI_OPTIONS_FAST20 |
Enables global FAST20 SCSI support: 20MB/sec transfers. |
SCSI_OPTIONS_FAST40 |
Enables global FAST40 SCSI support: 40MB/sec transfers. |
SCSI_OPTIONS_FAST80 |
Enables global FAST80 SCSI support: 80MB/sec transfers. |
SCSI_OPTIONS_WIDE |
Enables global WIDE SCSI. |
The setting of scsi_options affects all host adapter and target drivers present on the system (as opposed to scsi_ifsetcap(9F)). Refer to scsi_hba_attach(9F) for information on controlling these options for a particular host adapter.