Tc390a-specific pair status, Table 9 truecopy volume pair status, 9 truecopy volume pair status – HP StorageWorks XP Remote Web Console Software User Manual
Page 36: Table 9
36
Hitachi TrueCopy z/OS for HP XP12000/XP10000 and SVS 200 storage systems
simplex, and the MCU detects the pair deletion (if the path status is normal) and changes the M-VOL status
to suspended.
TC390A-specific pair status
The TC390A suspending and deleting transitional states occur when a request to change TC390A pair
status has been accepted, but the change to the requested status (suspended or simplex) is not yet
complete. These states are not reported to the host. In the case of suspending, both the user and the MCU
can request the status change. In the case of deleting, only the user can request the status change. If the
user requested the status change, the final status is reported at the end of the transition. If an error caused
the status to change to suspended, the suspended status is reported at the beginning of the transition.
The TC390A SEQCHK status is indicated when a TC390A pair assigned to a consistency group with the
System timer type accepts a non-time-stamped update from the primary system. The SEQCHK status does
not affect TC390A copy activities and will be removed when the next time-stamped update is successfully
copied to the R-VOL. However, if a disaster or system failure occurs before the next time-stamped update,
the update sequence consistency between the R-VOL and other R-VOLs in the consistency group is not
ensured. To ensure effective disaster recovery, you should detect and remove the source of the SEQCHK
status. The SEQCHK status can be caused by any of the following:
•
An application may issue update I/Os bypassing the MVS standard I/O procedure.
•
The I/O time-stamping function may not be active at the primary system.
Table 9
TrueCopy volume pair status
Pair Status
Description
Simplex
This volume is not currently assigned to a TC390 volume pair. When this volume is added
to a TC390 volume pair, its status will change to pending duplex.
Pending Duplex
The TC390 initial copy operation for this volume pair is in progress. This volume pair is not
yet synchronized. When the initial copy is complete, the status changes to duplex.
Duplex
This volume pair is synchronized. Updates to the M-VOL are duplicated on the R-VOL.
Suspended
(see
page 38 for suspend
types)
This volume pair is not synchronized:
For TC390 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 TC390A only, if the MCU detects a TC390A suspension condition (see ”
” on page 39), the MCU changes the M-VOL status and
R-VOL status (if possible) to suspended.
For TC390A only, when the RCU detects a TC390A suspension condition (see ”
” on page 39), the RCU changes the R-VOL status to
suspended.
For TC390 Synchronous only, the MCU changes the status of all TC390 Synchronous pairs
to suspended when it performs the CGROUP/RUN command (see ”
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 deleted from the RCU, the MCU
changes the status of the M-VOL to suspended.
Pair Status for TC390A 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.