HP StorageWorks XP Remote Web Console Software - Manual (Page 162)

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Initial Copy Parameters:
Copy Pace (3 or 15): select the number of the tracks for the resynchronize operation(s)
(default = 15). ◦
◦ Priority (from 0 to 256): set the desired priority (0-256) (scheduling order) for the
resynchronize operations (default = 32).
0 is the value for pairs created by CESTPAIR command or Business Continuity Manager.
◦ Time Stamp (Synchronous only): Specifies whether the host I/O time stamp is transferred
from M-VOL to R-VOL.
– Enable: The host I/O time stamp is transferred from M-VOL to R-VOL.
– Disable: The host I/O time stamp is not transferred from M-VOL to R-VOL.
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Asynchronous Parameters:
Resume Range (default = Group):
Group: all suspended TrueCopy for Mainframe Async pairs in the same group as the
selected pair will be resynchronized.
◦
Volume: only the selected TrueCopy for Mainframe Async pair(s) will be resynchronized.
For the Volume resynchronize range setting, if you select pairs with duplex status and
other than duplex status in the same consistency group, unexpected suspend may occur
during the pair operations (suspend, resynchronize, release) under heavy I/O load
conditions. You can estimate whether the I/O load is heavy or not from the rate of sidefile
cache (around 30%), or if you cannot see the sidefile cache rate, from the frequency of
host I/O. The resynchronize pair operations should be performed under light I/O load
conditions.
◦ Error Level: if desired, you can change the error level of the pair(s). This option is available
only when the Volume Resume Range option is selected.
If an MCU or RCU is powered off and its backup batteries are fully discharged while TrueCopy
for Mainframe pairs are suspended, the M-VOL/R-VOL differential data will not be retained. In
this unlikely case, the MCU/RCU will mark all tracks of all suspended TrueCopy volumes as
modified, so that the MCU will perform the equivalent of an entire initial copy operation when the
pairs are resynchronized. (The R-VOL cylinder/track map is used only for TrueCopy for Mainframe
Asynchronous operations.)
The CESTPAIR (MODE=RESYNC) command can be used to resynchronize suspended TrueCopy
for Mainframe Synchronous and TrueCopy for Mainframe Asynchronous pairs.
If you select a pair from the volume list and change the settings, and if you use a drop-down list
to set blank to a parameter, the parameter takes the default value for each pair. If you select the
settings from the preview list before applying the changed settings, and if you use a drop-down
list to set blank to a parameter in the Resume Pair dialog box, the parameter value in the preview
list will not be changed
To resynchronize one or more suspended TrueCopy for Mainframe pairs:
1. Determine if any data on the R-VOL has changed while the pair has been suspended. If so,
do not resynchronize the pair. You must release the pair from the MCU and then restart the
pair using the Entire initial copy mode option to resynchronize the M-VOL and R-VOL.
2. If any pair was suspended due to an error condition (use the Detailed Information dialog box
to view the suspend type), make sure that the error condition has been removed. The MCU
will not resynchronize the pair(s) until the error condition has been removed.
3. Connect to the MCU of the pair(s) to be resynchronized, open the TrueCopy for Mainframe
Pair Operation window.
162 Performing TrueCopy for Mainframe Pair Operations