HP StorageWorks XP Remote Web Console Software - Manual (Page 48)

The maintenance of a PDEV that is not used by Business Copy does not affect the Business Copy
operations and the status of Business Copy pairs. Even if a PDEV contains LDEVs used by Business
Copy, you can maintain that PDEV independently of the Business Copy operations or Business
Copy pair status. However, if a PDEV failure occurs, though Business Copy pair status is kept the
same as before failure, there will be affections such as degradation of copy pace.
If a failure occurs that requires the storage system to utilize dynamic sparing or automatic
correction copy, the status of the paired volumes associated with the failed physical device will
not be affected.
• Maintenance of LDEV
• If an LDEV failure occurs, the storage system suspends the pair.
• If the status of a Business Copy pair is either COPY(PD), PAIR, PSUS, PSUS(SP), COPY(SP),
COPY(RS) or COPY(RS-R), the maintenance for the LDEVs that are used by that pair will be
restricted. In addition, the maintenance for LDEVs that are set the Reserve attribute by Business
Copy will be restricted too. To maintain these LDEVs, suspend or delete the Business Copy
pair, or reset (unreserve) the Reserve attribute.
Cautions on Maintaining the Cache
If storage system cache maintenance is performed during a period of high I/O usage, one or more
Business Copy pairs may suspend. Reduce the I/O load before cache maintenance.
Cautions on Switching Off the Power Supply
If you have to switch off the power supply of the storage system during Business Copy operations,
make sure to:
• First complete the copying operation for the Business Copy pair in the COPY(SP) or PSUS(SP)
status to change the pair status from COPY(SP) or PSUS(SP) to PSUS, and then switch off the
power supply.
Note: If the shared memory is volatilized when you switch on the power supply again, the pair in
the COPY(SP) or PSUS(SP) status changes to PSUE.
• First complete the processing of At-Time Split function, and then switch off the power supply.
Note: If the status of only a part of the pairs in the same consistency group is changed, the
processing of At-Time Split function may not resume when you switch on the power supply, and
the status of some pairs may remain unchanged.
• Establish a timetable for any Business Copy copying operations that may take longer because of
the power-supply off (PSOFF).
Note: If the shared memory is volatilized when you switch on the power supply again, the
following conditions occur.
• If the Business Copy pair was in the COPY(PD) or COPY(SP) status, data that was already
copied before the power-supply off (PSOFF) again becomes the target data to be copied after
the power-supply on (PSON). Even if there is no host I/O, the data consistency rate does not
reach 100% when the Business Copy pair status changes to PAIR. When the Business Copy
pair status changes to PAIR, the target data is copied to the secondary volume.
• If the Business Copy pair was in the PAIR status, data that was already copied before the
power-supply off (PSOFF) again becomes the target data to be copied after the power-supply
on (PSON). In this case, the data consistency rate is 0%, and the target data is copied to
the S-VOL.
• If the Business Copy pair was in the PSUS status, the entire volume becomes the differential
data. In this case, the data consistency rate is 0%, and the entire volume is copied to the
secondary volume when you perform the pairresync operation.
Installing Business Copy
To operate Business Copy on the Remote Web Console computer, you need to install Business Copy by
using the license key.
48 Preparing for Business Copy Operations