HP StorageWorks XP Remote Web Console Software User Manual
Page 126
•
Difference Management: Select Auto, Cylinder, or Track as the basis for managing the
differential data. 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).
This option cannot be changed after a pair has been added.
•
Asynchronous Parameters (async only):
CT Group: Consistency group for the new pair(s). Consistency groups that have already
been added to the current MCU are displayed.
This option cannot be changed after a pair has been added.
◦
Only XP Continuous Access Asynchronous pairs that belong to the same CLPR can be
allocated to one consistency group. For further information on CLPRs, see the HP
StorageWorks XP24000/XP20000 Disk/Cache Partition User's Guide.
◦
Error Level: Error level for the new pair(s): Group, or LU (default = Group).
To create one or more new XP Continuous Access pairs:
1.
At the remote site:
a.
Make sure that the LU(s) that will be the S-VOL(s) are offline from all hosts.
b.
Connect to the storage system that will be the RCU for the new pair(s), and log on with
Administrator or XP Continuous Access write access.
c.
Make sure that the RCU remote copy ports are configured (RCU target port).
2.
At the main site:
a.
Connect to the storage system that will be the MCU for the new pair(s), and log on with
Administrator or XP Continuous Access write access.
b.
Make sure that the MCU remote copy ports are configured to the initiator port.
c.
Make sure that the correct RCU CU (contains the LUs that will be the S-VOLs) has been
added to the correct MCU CU (contains the LUs that will be the P-VOLs).
3.
Click the Pair Operation tab, and select the CU grouping, port, or host group that contains
the LU(s) that will be the P-VOL(s) of the new pairs. Make sure that you selected the proper
CU grouping, port, or host group. Use the Display Filter as needed to display the desired LUs
(for example, select SMPL status only).
4.
Select the LU(s) which will be the P-VOL(s) of the new XP Continuous Access pair(s). You can
create multiple pairs at the same time only when: (1) the S-VOLs are in the same RCU, and
(2) the pairs have the same copy mode (sync or async). You cannot create XP Continuous
Access Synchronous pairs and XP Continuous Access Asynchronous pairs at the same time.
If you create multiple pairs at the same time using LUs of the different CU numbers, you must
add an RCU to CU Free beforehand. Even if you have added an RCU to a CU, you cannot
create pairs.
5.
Right-click the LU(s), click Paircreate, and then select the desired pair mode (Synchronous or
Asynchronous) to open the Paircreate dialog box (see
“Paircreate Dialog Box for Synchronous
and
“Paircreate Dialog Box for Asynchronous Pairs” (page 124)
).
The update copy mode, sync or async, has the greatest impact on performance and must be
considered carefully (see
“Update Copy Operation” (page 17)
). Factors to consider in mode
selection include (but are not limited to) the use of XP Continuous Access (for disaster recovery
or migration), the number of pairs, and the write I/O activity to the P-VOLs.
6.
On the Paircreate dialog box, enter the desired S-VOL for the pair, and select the RCU. If you
are creating multiple pairs, select the S-VOL for the P-VOL being displayed. The S-VOLs for
the rest of the P-VOLs will be assigned automatically according to the LUN. For example, if
you select three P-VOLs and select LUN001 as the S-VOL for the first P-VOL, the S-VOLs for
the two other P-VOLs will be LUN002 and LUN003.
126
Performing XP Continuous Access Pair Operations