HP XP P9500 Storage - Manual (Page 56)

Pair operations during system, device maintenance
The following recommendations are provided for performing pair operations when maintenance
on P9500 and related devices is underway. Review the following to check whether pairs and pair
operations are affected when maintenance is performed on physical and logical devices.
•
If P9500 cache maintenance is performed during a period of high I/O usage, one or more
pairs may suspend. Reduce the I/O load before performing cache maintenance.
•
Physical devices that contain LDEVs used by Business Copy can be maintained independently
of pair operations and pair status. Maintenance does not affect Business Copy.
•
If a physical device failure occurs, pair status is not affected because of the RAID architecture.
•
If a physical device failure requires the storage system to utilize dynamic sparing or automatic
correction copy, pair status is not be affected.
•
If an LDEV failure occurs, the storage system suspends the pair.
•
Maintenance is restricted for LDEVs used by a pair. However, the format operation is allowed
(even when pair status is PSUE).
•
Maintenance is also restricted for LDEVs in which the Reserve attribute is set for a volume.
To maintain these LDEVs, suspend or delete the pair, and/or remove the reserve attribute.
56 Monitoring and maintaining the system