The IDENTIFY message(Table 3.86) is sent by either the initiator or the target establish an I_T_L nexus.
Table 3.86 IDENTIFY message
Bit | 7 | 6 | 5 | 4 | 3 | 2 |
| 1 |
| 0 |
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| Identify | DiscPriv | LUNTAR | Reserved | Reserved |
| LUNTRN |
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The Identify bit shall be set to one to specify that this is an IDENTIFY message.
A disconnect privilege (DiscPriv) bit of one indicates that the initiator has granted the target the privilege of disconnecting. A DiscPriv bit of zero specifies that the target shall not disconnect. This bit is not defined and shall be set to zero when an IDENTIFY message is sent by a target.
A logical unit target (LUNTAR) bit of zero specifies that the I/O process is directed to or from a logical unit. A LUNTAR bit of one specifies that the I/O process is directed to or from a target routine. This scanner supports direction to logical unit, LUNTAR bit is zero, only.
The logical unit number target routine number (LUNTRN) field specifies a logical unit number if the LUNTRN bit is zero. The response to an invalid value in the LUNTRN field is described in ANSI
An IDENTIFY message is invalid if a reserved bit is set to one or if the LUNTAR bit is set to one, this scanner may respond to an invalid IDENTIFY message by immediately sending a MESSAGE REJECT message.
An implied RESTORE POINTERS message shall be performed by the initiator prior to the assertion of the ACK signal for the next phase for an inbound IDENTIFY message sent during reconnection.
M3099GX/GH OEM Manual |