HP StorageWorks XP Remote Web Console Software User Manual
Page 127
Hitachi TrueCopy for z/OS user guide 127
NOTE:
When you set the several pairs at once and you want to keep some of the individual settings,
leave the parameter box blank. Then, only the parameters you enter are available.
•
M-VOL: Device ID of the M-VOL.
NOTE:
If # is added to the end of an LDEV number, such as 00:3F#, the LDEV is an external
volume. For more information about external volumes, see the HP StorageWorks XP External
Storage user guide for the XP12000/XP10000 disk array.
•
R-VOL: Select the R-VOL device ID for the specified M-VOL. If you selected more than one volume,
R-VOLs will automatically be assigned to the rest of the selected M-VOLs based on device ID. For
example, if you select three volumes on the Volume list and select LUN01 as R-VOL for the first M-VOL,
R-VOLs of the following M-VOLs are LUN02 and LUN03.
NOTE:
Verify all the assigned R-VOLs are available. If the automatically assigned R-VOLs are
already used for the other operation, you have to modify the R-VOL individually (see ”
parameters and omitting selected volumes
” on page 122 for instructions).
•
RCU: Select an RCU (Serial number, CU number, SSID, and Port type) for the TC390 pair(s) being
created. The RCUs that are already registered can be selected from the list. The RCU must be the same
for all pairs being created during this operation.
•
M-VOL Fence Level: The M-VOL Fence Level option (TC390 Synchronous only) specifies the conditions
under which the MCU will reject write operations to the M-VOL, which is known as “fencing.” This
option is very important for disaster recovery planning (see ”
Considering the M-VOL fence level setting
on page 145). TC390A M-VOLs are never fenced.
• If Data is selected, the M-VOL will be fenced when the MCU cannot successfully execute an update
copy operation for any reason. This setting is functionally equivalent to the CRIT(YES-ALL) parameter
for the CESTPAIR command.
• If Status is selected, the M-VOL will be fenced only if the MCU is not able to change the R-VOL pair
status to suspended when an update copy operation fails. If the MCU changes the R-VOL pair status
to suspended, subsequent write operations to the M-VOL will be permitted and the MCU will 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.
• If Never is selected, the M-VOL will never be fenced. If the TC390 volume 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.
•
Initial Copy Parameters: Select the initial copy options.
• Initial Copy. This option specifies the initial copy mode for the new pair(s).
If Entire is selected, the initial copy operation will copy all cylinders on the M-VOL (except
diagnostic and unassigned alternate tracks) to the R-VOL. This setting is functionally equivalent to
the MODE=COPY parameter for the CESTPAIR command.
If No Copy is selected, the initial copy operation will not be performed. The MCU will begin
performing update copy operations as needed. This setting is functionally equivalent to the
MODE=NOCOPY parameter for the CESTPAIR command.
CAUTION:
The user must ensure that the M-VOL and R-VOL are already identical when using this
setting.
• The Initial Copy Pace option specifies the maximum number of tracks that can be copied at one time
by the TC390 initial copy operation before the MCU accepts another host request: