HP StorageWorks XP Remote Web Console Software - Manual (Page 151)

keep track of all updates to the M-VOL while the pair is suspended. This setting is functionally
equivalent to the CRIT(YES-PATHS) parameter for the CESTPAIR command.
•
Never: the M-VOL will never be fenced. If the TrueCopy for Mainframe pair is suspended,
write operations to the M-VOL will be accepted. This setting is functionally equivalent to the
CRIT(NO) parameter for the CESTPAIR command.
For further information on the CESTPAIR CRIT parameter and its two modes of operation,
CRIT(YES-PATHS) and CRIT(YES-ALL), see the IBM document Advanced Copy Services (SC35-0355)
or DFSMS MVS V1 Remote Copy Guide and Reference (SC35-0169).
The CFW Data option specifies whether the CFW data will be copied to the R-VOL:
•
Copy to R-VOL: the MCU will copy the CFW data to the R-VOL.
If a TrueCopy for Mainframe pair is established using PPRC commands, the CFW data option
is set to the Copy to R-VOL setting.
By using Remote Copy Function Switch, you can set the following option with CESTPAIR: CFW
data = only M-VOL. To use this function, contact your HP service representative.
•
Only M-VOL: the MCU will not copy the CFW data to the R-VOL. This setting is recommended
for two reasons: (1) copying the CFW data impacts storage system performance, (2) CFW
data is typically used for temporary files (for example, sort work datasets) which are not usually
required for disaster recovery.
Error Level option (Async only). Specifies the error level for the TrueCopy for Mainframe
Asynchronous pair(s):
•
Group: When the specified pair is suspended, all TrueCopy for Mainframe Asynchronous
pairs in the same group will be suspended, even if the failure affects only that pair and not
the entire group.
IMPORTANT: Select the Group error level for all TrueCopy for Mainframe Asynchronous
volumes which are essential to disaster recovery. Suspended TrueCopy for Mainframe
Asynchronous R-VOLs which have the Volume error level should not be used for disaster
recovery.
•
Volume: If the failure affects only the specified pair, then only that pair will be suspended. A
failure that affects an entire group will always result in the suspension of all pairs in the group,
as well as all other affected TrueCopy for Mainframe pairs.
The CESTPAIR TSO command also allows you to specify the error level for TrueCopy for Mainframe
Asynchronous pairs.
Changing Pair Options
The Change Pair Option dialog box (see “Change Pair Option Dialog Box (Asynchronous)”
(page 152) ) allows you to change the pair options of existing TrueCopy for Mainframe pairs. To
open the Change Pair Option dialog box, click Pair Operation tab, select a CU grouping or CU
from the tree, select M-VOL from the list, right-click and click Change Pair Option command.
Changing Pair Options 151