Quantum ATL SuperLoader ATL, User Manual

Page: 128 / 196

Chapter 3 Media Changer Commands
Persistent Reserve Out Command (5Fh)
110 Quantum ATL SuperLoader Software Interface Guide
The following table presents the definitions of the characters of the
available “Type” values from the Type field of the PERSISTENT
RESERVE IN Read Reservations 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 46 Persistent
Reservation Type
Codes
06h Register
and
Ignore
Keys
This service action functions the same as the Register (00h) action except
the reservation key in the parameter list is ignored and treated as if it
matched the current registration, if one exists for the initiator.
Code Name Description
0h Obsolete
1h WRITE
Exclusive
READS: Shared; any application client on any initiator may execute
commands that perform transfers from the storage 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 storage 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 storage 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 storage medium results in a reservation conflict.
Code Name Description