Commands100
Read Capabilities service action
This provides a mechanism for the drive to report which features of Persistent Reservation are
implemented. The format of the data returned is as follows:
All the other fields are fixed. Refer to the description of
PERSISTENT RESERVE OUT or the appropriate
standards for more information.
the
PERSISTENT RESERVE IN command, and clause 5.6 for a detailed discussion of reservations.
PR Generation As for “Read Keys service action” on page 99.
Reservation Key The key under which the persistent reservation is held.
Scope 0Indicates LU_SCOPE.
Type The characteristics of the persistent reservation currently held. Persistent reservation
types supported by the drive are:
3h
6h
8h
Exclusive access
Exclusive access, registrants only
Exclusive access, all registrants
See PERSISTENT RESERVE OUT for more information and also the appropriate
standards.
7 6 5 4 3 2 1 0
0 (MSB)
Length (0008h)
1 (LSB)
2 Reserved (0) CRH (1) SIP_C (1) ATP_C(0) Rsvd(0) PTPL_C(1)
3 TMV (1) Reserved (0) PTPL_A
4 WR_EX_AR(0) EX_AC_RO(1) WR_EX_RO(0) Rsvd(0) EX_AC(1) Rsvd(0) WE_EXC(0) Rsvd(0)
5 Reserved (0) EX_AC_AR(1)
6
Reserved (0)
7
PTPL_A 0 Persist Through Power Loss has not been activated
1
The most recent successfully completed PERSISTENT RESERVE OUT command
with
Register or Register and Ignore Existing Key service action had the APTPL
bit set to one in the parameter data.
