HP XP7 Business Copy for Mainframe Systems User Guide (TK913-96001)

Pair user tasks during system and device maintenance

Check the following to determine whether pairs and pair user tasks are affected when you perform

maintenance on physical and logical devices:

• To prevent one or more pairs from suspending, perform XP7 cache maintenance during a

period of low I/O usage. Reduce the I/O load before performing cache maintenance.

• You can maintain the physical devices that contain LDEVs used by BC Z independently of pair

user tasks and pair status. Maintenance does not affect BC Z.

• If a physical device failure occurs, the pair status is not affected because of the RAID

architecture.

• If a physical device failure requires the XP7 storage system to utilize dynamic sparing or

automatic correction copy, the pair status is not be affected.

• If an LDEV failure occurs, the XP7 storage system suspends the pair.

• If an BC Z pair is using an LDEV, maintenance is restricted. You can block (for maintenance),

format, and restore the LDEV if it is used only by a pair in Suspend/SUSPER status.