User guide

D-16 Compaq Smart Array 431 Controller User Guide
Data Reliability
The Smart Array 431 Controller and the network operating system offer
several other fault management and data reliability features. These features
include:
■ Auto reliability monitoring
■ Dynamic sector repairing
■ Drive parameter tracking
■ Drive failure alert features
■ Interim data recovery
■ Automatic data recovery
■ Hot-pluggable drives (on Compaq servers and storage systems which
support hot-pluggable drives)
The following are not Smart Array 431 features, but may be functions
supported by the operating system:
■ Controller duplexing
■ Software-based drive mirroring
Auto Reliability Monitoring
Auto reliability monitoring (ARM) is a background process that scans hard
drives for bad sectors in fault-tolerant logical drives. ARM also verifies the
consistency of parity data in drives with data guarding or distributed data
guarding. This process assures that you can recover all data successfully if a
drive failure occurs in the future. ARM operates only when you select RAID 1
or RAID 5.
Dynamic Sector Repairing
Using the dynamic sector repairing process, the controller automatically
remaps any sectors with media faults it detects either during normal operation
or during auto reliability monitoring.