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

2-34 About TrueCopy for z/OS Operations
Hitachi Universal Storage Platform V TrueCopy for IBM z/OS User’s Guide
Table 2-5 TrueCopy for z/OS Pair Status
Pair Status Description
Simplex
This volume is not currently assigned to a TCz pair. When this volume is added to a TCz pair, its
status will change to pending duplex.
Pending Duplex
The TCz initial copy operation for this pair is in progress. This pair is not yet synchronized. When
the initial copy is complete, the status changes to duplex.
Duplex This pair is synchronized. Updates to the M-VOL are duplicated on the R-VOL.
Suspended
(see Table 2-6
for suspend
types)
This pair is not synchronized:
– For TCz Synchronous only, if the MCU cannot keep the pair synchronized for any reason, the
MCU changes the status of the M-VOL and R-VOL (if possible) to suspended.
– For TCzA only, if the MCU detects a TCzA suspension condition, the MCU changes the M-VOL
status and R-VOL status (if possible) to suspended.
– For TCzA only, when the RCU detects a TCzA suspension condition, the RCU changes the R-VOL
status to suspended.
– For TCz Synchronous only, the MCU changes the status of all TCz Synchronous pairs to
suspended when it performs the CGROUP/RUN command.
– When you suspend a pair from the MCU, the MCU changes the status of the M-VOL and R-VOL (if
possible) to suspended. When you suspend a pair from the RCU, the RCU changes the status of
the R-VOL to suspended.
– When the MCU detects that the pair was suspended or released from the RCU, the MCU changes
the status of the M-VOL to suspended.
Pair Status for TCzA only:
Suspending
This pair is not synchronized. This pair is in transition from duplex or pending duplex to
suspended. When the suspension is requested (by user, MCU, or RCU), the status of all affected
pairs changes to suspending. When the suspension is complete, the status changes to
suspended.
Deleting
This pair is not synchronized. This pair is in transition from duplex, pending duplex, or suspended
to simplex. When the release pair operation is requested (by user), the status of all affected pairs
changes to deleting. When the release pair operation is complete, the status changes to simplex.
SEQCHK
The RCU encountered a non-time-stamped recordset for a TCzA pair using the System timer
type option. This status can be displayed at the MCU and RCU, but the MCU may not have the
most current information. Always use the pair status information displayed at the RCU for
disaster recovery.