HP StorageWorks XP Remote Web Console Software - Manual (Page 141)

6. Verify the requested operation(s) in the preview list. Make sure that the pair release options
for each pair are correct.
To change one or more operations, select the operation(s) from the preview list, right-click,
and click Modify. To remove one or more operations, select the operation(s) from the preview
list, right-click, and click Delete. To cancel all operations, select all the operations in the preview
list, right-click, and click the Delete command, or click the Cancel button.
7. To start the operation(s), click the Apply button.
If one or more operation(s) did not start normally, the preview list displays only the operation(s)
that did not start normally. An error code is displayed in the Error Code column in the preview
list. To display an error message, select one LU, right-click, and click Error Detail. After you
see the error message, click OK button to close the error message.
8. On the Pair Operation window, verify that the pairsplit-S operations are completed successfully
(SMPL or Deleting and then SMPL status, not PSUE). To monitor the progress of the pairsplit-S
operation(s), click Refresh to update the information in the list, or use the Detailed Information
dialog box (see
“Viewing XP Continuous Access Pair Status” (page 127) ) to monitor the detailed
status of each pair.
To restart a pair that was released from the RCU, first release the pair from the MCU, and then
restart the pair using the appropriate initial copy option (Entire Volume or None).
Powering Off/On XP Continuous Access Components
The user is responsible for controlling power-off activities for storage systems involved in XP
Continuous Access operations. If you need to power off the storage system, call your HP Technical
Support representative for assistance. The following sections provide instructions for performing
planned outages of XP Continuous Access components.
If power is removed from an MCU while XP Continuous Access operations are in progress, the XP
Continuous Access pairs are not affected, but the update sequence consistency of the XP Continuous
Access Asynchronous groups at the RCU may be affected (see
“Planned Outage of the MCU”
(page 141) for further information). When power is restored to an MCU, the MCU communicates
with its RCU(s) to confirm the pair status of the S-VOLs. Make sure that XP Continuous Access
communications are fully restored (all paths have normal status) before beginning I/O operations
to the P-VOLs. If the MCU accepts a write I/O operation for a P-VOL before this confirmation is
complete, the MCU will suspend the pair and change the status of the P-VOL to suspended-by RCU.
The MCU will not be able to change the pair status of the S-VOL.
If power is removed from an RCU or remote copy connection while XP Continuous Access operations
are in progress, the MCU(s) will detect the communications failure, suspend all affected pairs, and
generate SIMs reporting the failures. The MCU will change the status of the P-VOLs to suspended-by
RCU but will not be able to change the status of the S-VOLs.
If an MCU/RCU is powered off and its backup batteries are fully discharged while XP Continuous
Access pairs are suspended, the P-VOL/S-VOL differential data will not be retained. In this unlikely
case, the MCU/RCU will mark all tracks of all suspended XP Continuous Access P-VOLs as modified
so that the MCU will perform the equivalent of an entire initial copy operation when the pairs are
resynchronized. The S-VOL differential data is used for XP Continuous Access Asynchronous
operations and for the XP Continuous Access S-VOL write enable option.
Planned Outage of the MCU
A planned MCU outage does not affect XP Continuous Access Synchronous. For XP Continuous
Access Asynchronous operations, the MCU must communicate with the RCU even if there are no
P-VOL update I/Os from the primary system. During the power-off sequence, the MCU automatically
suspends all XP Continuous Access Asynchronous pairs in the PAIR and COPY states (suspend type
= MCU P/S-OFF). During the power-on-reset sequence, the MCU automatically resynchronizes
these suspended pairs (pairs with other suspend types are not automatically resynchronized).
Powering Off/On XP Continuous Access Components 141