User`s guide

4 007-4834-001
1: Introduction to the SGI InfiniteStorage 4000
RAID Controller Features
The RAID controllers in the InfiniteStorage 4000 have the following features:
• 112-drive maximum configuration
• 4 RAID levels (0, 1, 3, and 5)
• 4 Gbit/s front end (FE) and back end (BE)
• Fibre Channel switched connection to disk (SBOD)
• Immediate LUN availability (ILA)
• Transparent disk drive rebuilds
• Variable stripe size per controller (16K, 32K, 64K, 128K, 256K and 512K)
• Mirrored cache
• Drive roaming during power off
• Cache coherency
• Transparent failover and failback
• Automatic error recovery
•Write through, write back, or read ahead support
• Automatic detection of failed drives
• Automatic drive rebuilds, using a “hot spare” drive
• Hot-swappable drives
• SAN mapping server to LUN mapping
• Automatic firmware flashing: In a dual controller configuration, the firmware of the
replacement controller is automatically flashed to match the firmware of the
surviving controller.