HP Compaq Integrated Smart Array Controller - Manual (Page 122)

B-16 Compaq Integrated Smart Array Controller User Guide
Compaq Confidential – Need to Know Required
Writer: CDresden Project: Compaq Integrated Smart Array Controller User Guide Comments:
Part Number: 153236-001 File Name: i-appb Understanding Drive Arrays.doc Last Saved On: 8/27/99 11:35 AM
Disk Drive Capacity Upgrades
Additional storage space may be obtained with the same number of physical
drives in a fault-tolerant configuration by replacing these drives with others of
higher capacity. By replacing the drives one at a time, the data on the new
drive is re-created from redundant information on the remaining drives. After
each new drive has been rebuilt, the next can be replaced. After all drives have
been replaced and rebuilt, the additional capacity on each drive can be used by
adding a new logical drive. The Array Configuration Utility recognizes the
unused space (with RAID 1, 0+1, and 5) and guides you through the
configuration procedures.
Data Reliability
The Integrated Smart Array 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-plug drives (on Compaq servers and storage systems supporting
hot-plug drives)
The following are not Integrated Smart Array Controller 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.