HP StorageWorks XP Remote Web Console Software - Manual (Page 35)

Table 8 TrueCopy for Mainframe Pair Status (continued)
Description Pair Status
Synchronous pairs to suspended when it performs the
CGROUP/FREEZE 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 TrueCopy for Mainframe Asynchronous only:
This pair is not synchronized. This pair is in transition from
duplex or pending duplex to suspended. When the Suspending
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.
This pair is not synchronized. This pair is in transition from
duplex, pending duplex, or suspended to simplex. When Deleting
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.
The RCU encountered a non-time stamped recordset for a
TrueCopy for Mainframe Asynchronous pair using the SEQCHK
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.
Suspended Pairs
“Suspend Types” (page 36) lists and describes the TrueCopy for Mainframe suspend types, which
indicate the reason for suspension. A TrueCopy for Mainframe pair can be suspended by the user
at any time after the initial copy operation is complete. The user must suspend a TrueCopy for
Mainframe pair in order to perform ICKDSF maintenance on the M-VOL or to access the R-VOL
(read only mode). TrueCopy for Mainframe pairs are also suspended when the CGROUP/ FREEZE
command is processed. When a TrueCopy for Mainframe Synchronous pair is suspended by the
user, the MCU ensures synchronization by completing any pending update copy operation before
changing the status to suspended. When a TrueCopy for Mainframe Asynchronous pair is suspended
by the user, the MCU and RCU ensure synchronization by either completing or discarding any
pending update copy operations according to the user-specified drain/purge suspend option.
A TrueCopy for Mainframe pair is suspended by the MCU when the following suspension conditions
are detected. A TrueCopy for Mainframe Asynchronous pair can also be suspended by the RCU.
•
When the MCU detects that the user has released the pair from the RCU (for example, to
access an R-VOL at the remote site)
•
When the MCU detects an error condition related to the RCU, R-VOL, a TrueCopy for
Mainframe Synchronous update copy operation or a TrueCopy for Mainframe Asynchronous
recordset operation
•
When the RCU cannot execute DFW (DASD fast write) to the R-VOL (only if DFW required is
selected)
•
When the MCU is unable to communicate with the RCU
Pair Status 35