Quantum ATL SuperLoader ATL, Руководство пользователя

Страница: 123 / 196

Chapter 3 Media Changer Commands
Persistent Reserve Out Command (5Fh)
Quantum ATL SuperLoader Software Interface Guide 105
Table 45 Persistent
Reserve Out
Command Service
Action
Code Name Description
00h Register When the command executes a Register service action, it registers a
reservation key with a device server without generating a reservation. The
device server holds these reservation keys from each initiator that
performs a PERSISTENT RESERVE OUT command with a Register
service action until the key is changed by a new PERSISTENT RESERVE
OUT command with Register service action from the same initiator, or
until the initiator registration is removed by:
Powering down the logical unit, if the last Activate Persist Through Power
Loss (APTPL; see figure 56 on page 112 and table 47 on page 113) received
by the device server was 0;
Performing a Clear service action;
Performing a Pre-empt service action;
Performing a Pre-empt and Clear service action; or
Performing a Register service action from the same initiator with the
value of the service action reservation key set to 0.
When a reservation key has not yet been established or when the
reservation key has been removed, a reservation key of 0 is used when the
initiator performs a PERSISTENT RESERVE OUT with the Register
service action. When the reservation has been removed, no information is
reported for the initiator in the Read Keys service action of the resulting
PERSISTENT RESERVE IN command.
01h Reserve A PERSISTENT RESERVE OUT command with Reserve service action
creates a persistent reservation with a specified Scope and Type.
Persistent reservations are not superseded by a new persistent reservation
from any initiator except by the execution of a PERSISTENT RESERVE
OUT command that specifies a Release, Clear, Pre-empt, or Pre-empt and
Clear service action.