Reference Guide

Chapter 4 SCSI Commands
PERSISTENT RESERVE OUT Command (5Fh)
DLT-S4 Interface Reference Guide 226
Table 124 presents the definitions of the available Type values from the
Type field of the
PERSISTENT RESERVE OUT Read Reservation
parameters. Each of the codes provides handling instructions for
READ
operations, for
WRITE operations, and for subsequent attempts to
establish persistent reservations (referred to as “Additional Reservations
Allowed” in the table).
Table 124 PERSISTENT
RESERVE OUT Type Codes
Code Name Description
0h Obsolete ---
1h
WRITE
Exclusive
READS: Shared. Any application client on any initiator may execute commands
that perform transfers from the tape medium to the initiator.
WRITES: Exclusive. Any command from any initiator other than the initiator that
holds the persistent reservation that attempts a transfer to the tape medium
results in a reservation conflict.
2h Obsolete ---
3h Exclusive
Access
READS: Exclusive. Any command from any initiator other than the initiator
holding the persistent reservation that attempts a transfer from the tape medium
results in a reservation conflict.
WRITES: Exclusive. Any command from any initiator other than the initiator
holding the persistent reservation that attempts a transfer to the tape medium
results in a reservation conflict.
4h Obsolete ---
5h
WRITE
Exclusive
Registrants
Only
READS: Shared. Any application client on any initiator may execute commands
that perform transfers from the tape medium to the initiator.
WRITES: Exclusive. Any command from an initiator that has not previously
performed a Register service action with the drive that attempts a transfer to the
tape medium results in a reservation conflict.
6h Exclusive
Access
Registrants
Only
READS: Exclusive. Any command from an initiator that has not previously
performed a Register service action with the drive that attempts a transfer from
the tape medium results in a reservation conflict.
WRITES: Exclusive. Any command from an initiator that has not previously
performed a Register service action with the drive that attempts a transfer to the
tape medium results in a reservation conflict.