User Manual

SCSI Commands Reference Manual, Rev. J 122
www.seagate.com Direct Access Block commands (SPC-5 and SBC-4)
PERSISTENT RESERVATION TYPE MASK field
The PERSISTENT RESERVATION TYPE MASK field (see table 85) contains a bit map that indicates the persistent reservation types
that are supported by the device server.
WR_EX_AR (Write Exclusive – All Registrants) bit
1 A Write Exclusive – All Registrants (WR_EX_AR) bit set to one indicates that the device server supports the Write Exclusive – All Regis-
trants persistent reservation type.
0 An WR_EX_AR bit set to zero indicates that the device server does not support the Write Exclusive – All Registrants persistent reservation
type.
EX_AC_RO (Exclusive Access – Registrants Only) bit
1 An Exclusive Access – Registrants Only (EX_AC_RO) bit set to one indicates that the device server supports the Exclusive Access – Regis-
trants Only persistent reservation type.
0 An EX_AC_RO bit set to zero indicates that the device server does not support the Exclusive Access – Registrants Only persistent reserva-
tion type.
WR_EX_RO (Write Exclusive – Registrants Only) bit
1 A Write Exclusive – Registrants Only (WR_EX_RO) bit set to one indicates that the device server supports the Write Exclusive – Regis-
trants Only persistent reservation type.
0 An WR_EX_RO bit set to zero indicates that the device server does not support the Write Exclusive – Registrants Only persistent reserva-
tion type.
EX_AC (Exclusive Access) bit
1 An Exclusive Access (EX_AC) bit set to one indicates that the device server supports the Exclusive Access persistent reservation type.
0 An EX_AC bit set to zero indicates that the device server does not support the Exclusive Access persistent reservation type.
WR_EX (Write Exclusive) bit
1 A Write Exclusive (WR_EX) bit set to one indicates that the device server supports the Write Exclusive persistent reservation type.
0 An WR_EX bit set to zero indicates that the device server does not support the Write Exclusive persistent reservation type.
EX_AC_AR (Exclusive Access – All Registrants)
1 An Exclusive Access – All Registrants (EX_AC_AR) bit set to one indicates that the device server supports the Exclusive Access – All Regis-
trants persistent reservation type.
0 An EX_AC_AR bit set to zero indicates that the device server does not support the Exclusive Access – All Registrants persistent reserva-
tion type.
Table 85 Persistent Reservation Type Mask format
Bit
Byte
7 6 5 4 3 2 1 0
4
WR_EX_AR EX_AC_RO WR_EX_RO Reserved EX_AC Reserved WR_EX Reserved
5
Reserved EX_AC_AR