Open SCSI Integrator's Manual for NonStop S-Series Servers

The Open SCSI I/O Process (IOP)

Open SCSI Integrator’s Manual for NonStop Servers—422988-002

4-14

The CAM Control Block (CCB)

4 CAM flags (see Table 4-2 on page 4-10) Yes

4 Peripheral driver pointer Yes

4 Next CCB pointer Yes

4 Request mapping information No

4 Callback on completion No

4 Data-buffer pointer: byte offset of data buffer from

start of WRITEREAD buffer (not used for

scatter/gather list)

Yes

4 Data transfer length Yes

4 Sense-buffer pointer: byte offset of sense buffer from

start of WRITEREAD buffer

Yes

1 Sens- buffer length Yes

1 Command descriptor block (CDB) length: must be

one of the three values 6, 10, or 12

Yes

2 Number of scatter/gather entries No

4 Vendor-unique (VU) field No

1 SCSI status Yes

1 Autosense residual length Yes

2(Reserved) -

4 Residual length Yes

12 Command descriptor block (CDB) Yes

4 Timeout value Yes

4 Message-buffer pointer (target only) No

2 Message-buffer length (target only) No

2 Vendor-unique (VU) flags No

1 Tagged queue action No

1 Tag ID (target only) No

1 Initiator ID (target only) No

1(Reserved) -

n Private data No

Table 4-5. CCB Structure for Execute SCSI I/O (page 2 of 2)

Size of Field

(in bytes) Description

Supported by

Open SCSI IOP?