User Manual

Interfacing With the Open SCSI I/O Process (IOP)

Open SCSI for Fibre Channel Controller Integrator’s Manual for HP Integrity NonStop NS-Series Servers—

3-9

The CAM Control Block (CCB)

When you use the Open SCSI interface, the CCB control field in the WRITEREAD

buffer must correspond exactly to the structure of a CCB for each CAM operation even

if not all the fields of the CCB are needed by a particular operation. One exception to

this rule is that the Open SCSI IOP does not support the Connect ID field of the CCB

(see Table 3-3 on page 3-12) because this path information is specified when the IOP

is configured through SYSGENR.

CAM Operations

Table 3-1 shows the Common Access Method (CAM) operations, indicates which ones

are supported by the Open SCSI IOP, and also directs you to a table describing the

CCB structure for each supported operation. For a detailed description of these

operations, see the ANSI CAM specification Information Technology - SCSI-2 Common

Access Method Transport and SCSI Interface Module (ANSI X3.221 - 1994).

Table 3-1. CAM Operations (page1of2)

CAM Operation

Code

(in hex) Description

Supported by

Open SCSI?

00 No Operation (See Table 3-3

on page 3-12.) Yes

01 Execute SCSI I/O (See Table 3-5

on page 3-13.) Yes

02 Get Device Type No

03 Path Inquiry No

04 Release SIM Queue (See Table 3-3

on page 3-12.) Yes

05 Set Async Callback No

06 Set Device Type No

07 Scan SCSI Bus No

08-0F (Reserved) -

10 Abort SCSI Command (See Table 3-4

on page 3-13.) Yes

11 Reset SCSI Bus No

12 Reset SCSI Device (See Table 3-3

on page 3-12.) Yes*

13 Terminate I/O Process No

14-1F (Reserved) -

20 Engine Inquiry No

21 Execute Engine Request No

22-2F (Reserved) -

30-3F Target mode and reserved operations No

40-7F (Reserved) -

80 (Reserved — used by HP) -