Hitachi TrueCopy for IBM z/OS User and Reference Guide (T5211-96001, June 2007)

About TrueCopy for z/OS Operations 2-37
Hitachi Universal Storage Platform V TrueCopy for IBM z/OS User’s Guide
Table 2-6 Suspend Types
Suspend Type Applies to Description
M-VOL by
operator
M-VOL (TCz Sync
only)
The user suspended the pair from the MCU using the M-VOL Failure option.
The R-VOL suspend type is by MCU.
R-VOL by
operator
M-VOL, R-VOL The user suspended the pair from the MCU or RCU using the R-VOL option.
by MCU R-VOL The RCU received a request from the MCU to suspend the pair. The M-VOL
suspend type is M-VOL by Operator or R-VOL by Operator.
by RCU M-VOL The MCU detected an error condition at the RCU which caused the MCU to
suspend the TCz pair. The R-VOL suspend type is by MCU.
Release Pair to
RCU
M-VOL The MCU detected that the R-VOL status changed to simplex because the user
released the pair from the RCU. The pair cannot be resynchronized because the
R-VOL does not have the suspended status.
R-VOL Failure M-VOL The MCU detected an error during communication with the RCU or an I/O error
during update copy. In this case, the R-VOL suspend type is usually by MCU.
MCU IMPL M-VOL, R-VOL The MCU could not find valid control information in its nonvolatile memory
during the IMPL procedure. This condition occurs only if the MCU is completely
without power for more than 48 hours (e.g., power failure and fully discharged
backup batteries).
Initial Copy
failed
M-VOL, R-VOL The pair was suspended before the initial copy operation was complete. The
data on the R-VOL is not identical to the data on the M-VOL.
by FREEZE M-VOL, R-VOL
(TCz Sync only)
The pair was suspended by the CGROUP/RUN TSO command.
MCU P/S-OFF R-VOL
(TCzA only)
The RCU received a request from the MCU to suspend the R-VOL due to MCU
power-off. The RCU stops expecting recordsets from that MCU.
by sidefile
overflow
M-VOL, R-VOL
(TCzA only)
The amount of sidefile exceeds the specified “current pending update data
rate”, and the RCU data is not transferred within the specified “offloading
timer”.
Table 2-7 Consistency Status for Suspended TrueCopy for z/OS Async R-
VOLs
Consistency Status Description
Volume This TCzA pair was probably suspended alone. Update sequence consistency between this R-
VOL and other R-VOLs in this consistency group is not ensured. This R-VOL cannot be used for
disaster recovery at the secondary system. This status is indicated when:
– This pair was suspended due to a failure that did not affect the entire consistency group,
and the Error Level pair option for this pair is set to Volume.
– This pair was suspended by a user-initiated suspend pair operation with the TCzA Suspend
Range suspend option set to Volume.
Group This TCzA pair was suspended along with the other pair in its consistency group. Update
sequence consistency between this R-VOL and other R-VOLs in this consistency group is
ensured. This R-VOL can be used for disaster recovery at the secondary system (after
releasing the TCz pair from the RCU). This status is indicated when:
– All pairs in this consistency group were suspended due to a failure that affected the entire
consistency group (not just one pair) (e.g., MCU-RCU communication failure).
– The pair was suspended due to a failure that did not affect the entire group, and the Error
Level TCzA pair option for this pair is set to Group.