HP XP P9500 Storage - Manual (Page 39)

Table 6 Pair status descriptions split types—PSUS status
Description Volume
applied to Type
The user split the pair from the primary system using the P-VOL Failure on
the Suspend Type option in the Suspend Kind field. The S-VOL split type is
PSUS-by MCU. P-VOL P-VOL by Operator
The user split the pair from the primary or secondary system using the S-VOL
on the Suspend Type option in the Suspend Kind field. Or, the pair is split
because of a failover in the storage system. P-VOL
S-VOL
S-VOL by Operator
The secondary system received a request from the primary system to split the
pair. The P-VOL split type is PSUS-P-VOL by Operator or PSUS-S-VOL by
Operator. S-VOL by MCU
The primary system detected that the S-VOL status changed to SMPL because
the user released the pair from the secondary system. The pair cannot be
resynchronized because the S-VOL does not have the PSUS/PSUE status. P-VOL Delete pair to RCU
Suspend types (PSUE status)
Suspend types appear on the Detailed Information dialog box; they specify why the pair was
suspended by the system.
The primary system suspends a pair when the following conditions occur:
•
The user has released the pair from the secondary system.
•
An error condition related to the secondary system, the S-VOL, or the update copy operation.
•
Communications with the secondary system have stopped.
When a pair is suspended, the primary system stops sending updates to the S-VOL even though
host applications may continue updating the P-VOL. The primary system records the P-VOL's updated
tracks as differential data. This data is copied to the S-VOL when the error condition is cleared
and the pair is resynchronized.
P-VOL/S-VOL differential data is not retained if a primary or secondary system is powered off and
its backup batteries are fully discharged while the pairs are suspended. In this unlikely case, the
primary system performs the equivalent of an entire initial copy operation when the pairs are
resynchronized.
The following table explains suspend types.
Table 7 Suspend types—PSUE status
Description Volume
applied to Type
The primary system detected an error condition at the secondary system
(RCU) which caused the primary system to suspend the pair. The S-VOL
suspend type is S-VOL Failure. P-VOL
S-VOL
by RCU
The primary system detected an error during secondary system
communication, or an error during update copy. In this case, the S-VOL P-VOL
S-VOL
S-VOL Failure
suspend type is usually S-VOL Failure. This suspend type is also used
when the number of paths falls below the minimum number of paths
setting on the RCU Option dialog box.
The primary system could not find valid control information in its
nonvolatile memory during IMPL. This condition occurs only if the primary P-VOL
S-VOL
MCU IMPL
system is without power for more than 48 hours (i.e., power failure and
fully discharged backup batteries).
The pair was suspended before the initial copy operation was complete.
The data on the S-VOL is not identical to the data on the P-VOL. P-VOL
S-VOL
Initial Copy Failed
Monitoring pair status 39