HP A7143A RAID160 SA Controller Support Guide, February 2007

RAID160 SA Controller Overview
Board Components and Features
Chapter 2
25
Figure 2-2 Array Accelerator Cache with Batteries
For detailed controller board specifications, refer to Appendix B, “Controller Specifications”.
Overview of Controller Features
• Four Wide Ultra160 SCSI channels, supporting up to 56 disk drives (4 channels, 14 drives per channel)
• Support for HP-UX 11i v1 Operating System (64-bit only)
• Backward compatibility with Wide Ultra2 devices
• Removable array accelerator
• 64-bit, 33/66-MHz PCI system interface
• Other features supported:
— RAID 0 (striping)
— RAID 1, 1+0, 5, and ADG (fault tolerant)
— vPars (HP-UX Virtual Partitions)
—Ignite UX
— Hot-pluggable disk drives
— Drive movement
— Adjustable stripe size
— S.M.A.R.T. disk drives
— Multiple online spares per array
— Background initialization
Overview of Array Accelerator Features
The array accelerator is a high performance, battery-backed, 100-MHz SDRAM DIMM cache module.
The RAID160 SA controller uses cache to store read data from the disk drives. The system can later access
this read data. The controller firmware uses the “read-ahead” and “most recently used” caching algorithms.