System information

Introduction
1-2
1.2 Key Features
• Basic RAID Construction
• Multiple RAID levels: 0, 1, 3, 5, 6, 10, 30, 50, 60, JBOD, and NRAID
• Multiple stripe sizes (KB): 4, 8, 16, 32, 64, 128, 256, and 512.
• Independently-selectable strip size for each logical disk
• Independently-selectable RAID level for each logical disk
• Support Quick Setup for effortless and quick RAID configuration
• Support hot spare with global spare and local spare
• Support auto spare and spare restore options
• Support auto online disk rebuilding and configurable rebuild modes
• Multiple disk rebuilding modes: parallel, sequential, and prioritized
• Support up to 8 disk groups and 32 logical disks per disk group
• Support up to 24 disks in one chassis and totally 64 drives with expansion units
• Volume management
• Support striping volume for performance enhancement
• Support concatenating volume for large-capacity LUN
• Support concatenated striping volume
• Online volume capacity expansion
• Online volume capacity shrink
• Support up to 32 volumes and 8 logical disks per volume
• Augmented RAID Features
• Flexible free chunk management
• Multiple RAID initializations: none, regular (write-zero), and background
• Support disk group write-zero initialization
• Support user-configurable disk group capacity truncation
• Support alignment offset
• Support intelligent computation for RAID data and parity
• Support fast read I/O response
• Support NVRAM-based write log and auto parity consistency recovery
• Support online bad block recovery and reallocation
• Support battery backup module (BBM) for data retention during no power
• Caching and Performance Optimizations
• Selective cache unit sizes (KB): 4, 8, 16, 32, 64, and 128
• Independently-selectable caching policies for each LUN
• Selective pre-read options with pre-read depth
• Adaptive pre-read algorithms for sequential read workload
• Selective write caching policies: write-through and write-behind (delay write)
• Selective cache flush period with manual flush utility
• Support intelligent write I/O merging and sorting algorithms
• Support intelligent disk I/O scheduling
• Selective performance profile: AV streaming, Max IOPS, and Max throughput
• RAID Reconfiguration Utilities
• Online disk group expansion
• Online RAID level migration
• Online stripe size migration
• Online simultaneous execution of the operations above
• Online disk group defragmentation for free space consolidation