HP XP Racks - Manual (Page 77)

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.
Related topics
•
“Performance planning and calibrating your XP7 storage system” (page 18)
Workflow for maintaining the system 77