User guide

Introduction
The RA4000 Controller is a drive array controller designed for installation in
the RA4000. The RA4000 Controller supports Wide-Ultra SCSI-3, Fast-Wide
SCSI-2, and Fast SCSI-2. The RA4000 is equipped with one installed RA4000
Controller.
The advanced features supported by the RA4000 Controller are:
n Support for RAID 0, 1, 4, and 5 fault-tolerance options
n Fibre Channel support for connection to the server
n Support for Wide-Ultra SCSI-3, Fast-Wide SCSI-2, and Fast SCSI-2
hard drives
n Online Capacity Expansion (Microsoft Windows NT and Novell
NetWare only)
n Online Volume Extension
n Online Stripe Size Migration
n Online RAID Migration
n Removable RA4000 Controller Cache
n Battery-backed 64-MB Cache with ECC memory
n Controller board containing a 16-MB Read Cache
n Performance monitoring through Compaq Insight Manager
n Automatic performance tuning
n Pre-failure notification on hard disk drives
n Array Configuration Utility (ACU)
n Read-ahead caching
n Tagged-command queuing
n Multiple logical drives per RA4000
n Array Diagnostics Utility (ADU)