User Manual

SCSI Commands Reference Manual, Rev. J 119
www.seagate.com Direct Access Block commands (SPC-5 and SBC-4)
3.13.3.3 Persistent reservations scope
The SCOPE field (see table 81) shall be set to LU_SCOPE, specifying that the persistent reservation applies to the entire logical
unit.
The LU_SCOPE scope shall be implemented by all device servers that implement PERSISTENT RESERVE OUT.
3.13.3.4 Persistent reservations type
The TYPE field (see table 82) specifies the characteristics of the persistent reservation being established for all logical blocks
within the logical unit.
SPC-5 defines the persistent reservation types under which each command defined in that standard is
allowed to be processed. Each other command standard (e.g., SBC-4, SSC-3, SMC-3, MMC-5, or SES-3) defines the persistent
reservation types under which each command defined in that command standard is allowed to be processed.
Table 81 Persistent reservation scope codes
Code Name Description
0h
LU_SCOPE Persistent reservation applies to the full logical unit
1h - 2h
Obsolete
3h - Fh
Reserved
Table 82 Persistent reservation type codes
Code Name Description
0h
Obsolete
1h
Write
Exclusive
Access Restrictions: Some commands (e.g., media-access write commands) are only
allowed for the persistent reservation holder (see SPC-5).
Persistent Reservation Holder: There is only one persistent reservation holder.
2h
Obsolete
3h
Exclusive
Access
Access Restrictions: Some commands (e.g., media-access commands) are only allowed for
the persistent reservation holder (see SPC-5).
Persistent Reservation Holder: There is only one persistent reservation holder.
4h
Obsolete
5h
Write Exclusive –
Registrants
Only
Access Restrictions: Some commands (e.g., media-access write commands) are only
allowed for registered I_T nexuses.
Persistent Reservation Holder: There is only one persistent reservation holder (see SPC-5).
6h
Exclusive Access –
Registrants
Only
Access Restrictions: Some commands (e.g., media-access commands) are only allowed for
registered I_T nexuses.
Persistent Reservation Holder: There is only one persistent reservation holder (see SPC-5).
7h
Write Exclusive –
All
Registrants
Access Restrictions: Some commands (e.g., media-access write commands) are only
allowed for registered I_T nexuses.
Persistent Reservation Holder: Each registered I_T nexus is a persistent reservation holder
(see SPC-5).
8h
Exclusive Access –
All
Registrants
Access Restrictions: Some commands (e.g., media-access commands) are only allowed for
registered I_T nexuses.
Persistent Reservation Holder: Each registered I_T nexus is a persistent reservation holder
(see SPC-5).
9h - Fh
Reserved