HP StorageWorks XP Remote Web Console Software - Manual (Page 124)

list. To display an error message, select one LU, right-click, and click Error Detail. After you
see the error message, click OK to close the error message.
11. On the Pair Operation window, verify that the paircreate operations are displayed correctly
(COPY status) in the list. To monitor the progress of the paircreate operation(s), click File, and
then Refresh on the menu bar of the Remote Web Console main window to update the
information in the list, or use the Detailed Information dialog box (see
“Detailed Information
Dialog Box” (page 128) ) to monitor the detailed status of each pair.
If an error occurs, you can display the error message by right-clicking on the operation, and
clicking the Error Detail command.
The Paircreate operation will be rejected if the P-VOL is in the correction access or correction
copy state. If this occurs, wait for the volume state to change, and then repeat this procedure.
If the status is not displaying correctly, make sure that the correct CU is selected.
Initial Copy Options
When you create new XP Continuous Access pairs, you select the initial copy options on the
Paircreate dialog box. After a pair has been created (that is, the paircreate operation has started),
you cannot change the initial copy options unless you release and then restart the pair.
Initial Copy: Specifies the initial copy mode for the new pair(s) (default = Entire Volume):
•
Entire Volume: The initial copy operation will copy all tracks on the P-VOL (except diagnostic
and unassigned alternate tracks) to the S-VOL.
•
None: The initial copy operation will not be performed. The MCU will begin performing update
copy operations as needed.
IMPORTANT: The user must ensure that the P-VOL and S-VOL are already identical when
using this setting.
Copy Pace: Specifies the maximum number of tracks (1-15) that can be copied at one time by the
XP Continuous Access initial copy operation before the MCU accepts another host request for that
P-VOL (default = 15). A high setting (for example, 15 tracks) speeds up the initial copy operation
but may affect the storage system’s I/O performance if the P-VOL is experiencing high write I/O
activity. A lower setting (for example, 3 tracks) slows down the initial copy operation to minimize
the impact of the initial copy operation on the storage system’s I/O performance.
Priority: Specifies the order in which the initial copy operations will be performed, if the number
of requested initial copy operations is greater than the maximum initial copy activity setting on the
System Option window. The highest priority is 1, and the lowest priority is 256 (current default =
32). The XP Continuous Access initial copy priority option can be used to spread initial copy
operations across array groups and/or array domains (DKA pairs) to reduce initial copy time and
to prevent host I/O contention.
Difference management: Specifies the measurement method that XP Continuous Access uses to
manage the differential data for the pair: auto, cylinder, or track. The default setting is Auto. When
you select Auto, either Cylinder or Track is selected depending on the basic size of the logical unit
(LU). See
“Difference Management” (page 19) for further information on this option.
Example: If the maximum initial copy activity setting is four, and you create six pairs at the same
time (for LUNs 000 through 005), the initial copy priority is set as follows:
Priority P-VOL of Pair
1 LUN 03
2 LUN 05
3 LUN 00
124 Performing XP Continuous Access Pair Operations