Suspended pairs – HP StorageWorks XP Remote Web Console Software User Manual
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TrueCopy for the XP128/XP1024/XP10000/XP12000
Suspended Pairs
lists and describes the TC390 suspend types, which indicate the reason for
suspension. A user can suspend aTC390 pair at any time after the initial copy operation is complete. The
user must suspend a TC390 pair to perform ICKDSF maintenance on the M-VOL or to access the R-VOL
(read only mode). TC390 pairs are also suspended when the CGROUP/ RUN command is processed (see
CGROUP (FREEZE/RUN) Support” on page 158
). When the user suspends a TC390 Synchronous pair, the
MCU ensures synchronization by completing any pending update copy operation before changing the
status to suspended. When the user suspends a TC390A pair, 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 TC390 pair is suspended by the MCU when any of the following suspension conditions are detected. A
TC390A pair can also be suspended by the RCU (see ”
Suspended TrueCopy Asynchronous Pairs
•
When the MCU detects that the user has deleted the volume 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 TC390 Synchronous update
copy operation or a TC390A recordset operation (see ”
Suspended TrueCopy Asynchronous Pairs
•
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.
Suspended
(see
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 40), 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 40), 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 ”
(FREEZE/RUN) Support” on page 158
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.
Deleting
This pair is not synchronized. This pair is in transition from duplex, pending duplex, or
suspended to simplex. When the delete pair operation is requested (by user), the status of
all affected pairs changes to deleting. When the delete pair operation is complete, the
status changes to simplex.
SEQCHK
The RCU encountered a non-time-stamped recordset for a TC390A 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.
Table 9
TrueCopy volume pair status (continued)
Pair Status
Description