SNAX/APC Configuration and Management Manual

Objects for SNAX/APC
SNAX/APC Configuration and Management Manual—138787
7-21
TPI States
2. The TPN object enters the STARTED state when it receives a START TPN
command if the local LU is in the STARTED state. The TPN object enters the
STARTING state upon receipt of the START TPN command if the local LU is in the
STARTING state. If the local LU is in the STARTING state, the TPN object
remains in the STARTING state until the local LU has started, at which time the
TPN enters the STARTED state.
3. If the local LU of a TPN object in the STARTED state receives a file system error
from the underlying access method, the local LU and the TPN object return to the
STARTING state until a successful open to the access method occurs when the local
LU and the TPN object reenter the STARTED state.
4. The TPN object enters the STOPPED state from the STARTING state or the
STARTED state upon receipt of the ABORT or STOP command.
5. The TPN object ceases to exist if it receives a DELETE command while in the
STOPPED state.
Figure 7-8
illustrates how the different requests and commands affect the state of the
TPN object.
TPI States
The following describes the states of the TPI object.
1. A TPI object is created and enters the STARTING state when a TP-READY or
ATTACH request is received.
Figure 7-8. The TPN States
108CDT .CDD
Nonexisting
STARTED
STOPPED
ADD
Command
START Command
(when parent LU
is in STARTED
state)
DELETE
Command
ABORT
or STOP
Command
STARTING
TP-READY triggers
the open to the access
method and the open
is successful.
The parent LU receives a file system error
from the underlying access method.
ABORT or STOP Command
START Command
(when parent LU is
in STARTING state)
START/TP-READY/RETRY
(when parent LU is
in STARTING state)