User Manual

SCSI Commands Reference Manual, Rev. J 125
www.seagate.com Direct Access Block commands (SPC-5 and SBC-4)
ALL_TG_PT (All Target Ports) bit
0 An All Target Ports (ALL_TG_PT) bit set to zero indicates that this full status descriptor represents a single I_T nexus.
1 An ALL_TG_PT bit set to one indicates that:
a) This full status descriptor represents all the I_T nexuses that are associated with both:
1. The initiator port specified by the TRANSPORTID field; and
2. Every target port in the SCSI target device;
b) All the I_T nexuses are registered with the same reservation key; and
c) All the I_T nexuses are either reservation holders or not reservation holders as indicated by the R_HOLDER bit.
The device server is not required to return an ALL_TG_PT bit set to one. Instead, it may return separate full status descriptors for
each I_T nexus.
R_HOLDER bit
1 If the R_HOLDER bit is set to one (i.e., if the I_T nexus described by this full status descriptor is a reservation holder), the SCOPE field and
the TYPE field are as defined in the READ RESERVATION service action parameter data (see 3.13.3).
0 If the R_HOLDER bit is set to zero, the contents of the SCOPE field and the TYPE field are not defined by this manual.
ALL_TG_PT bit
0 If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT IDENTIFIER field contains the relative port identifier (see SPC-5) of the target
port that is part of the I_T nexus described by this full status descriptor.
1 If the ALL_TG_PT bit is set to one, the contents of the RELATIVE TARGET PORT IDENTIFIER field are not defined by this manual.
ADDITIONAL DESCRIPTOR LENGTH field
The ADDITIONAL DESCRIPTOR LENGTH field contains a count of the number of bytes that follow in the descriptor (i.e., the size of the TRANS-
PORTID).
TRANSPORTID field
The TRANSPORTID field contains a TRANSPORTID (see SPC-5) identifying the initiator port that is part of the I_T nexus or I_T nexuses described
by this full status descriptor.