Chapter 1: Introduction to VTrak
5
Subsystem and Controller Features
Drive Support: 3.5" x 1" hard disk drives: SATA II 3Gb/s and 1.5Gb/s.
Supports any mix of SATA II 3 Gb/s or 1.5 Gb/s drives simultaneously in the same
system. Staggered physical drive spin-up.
External I/O Ports: Dual iSCSI 1 Gb/s host ports.
Data Cache: Shared 256 MB predictive data cache (expandable to 1 GB);
Automatic write cache destaging.
Optional Battery Backup Unit (BBU) powers the data cache up to 72-hours in the
event of a power failure.
Operational Features
RAID Levels: RAID 0, 1, 1E, 5, 6, 10, and 50 – Any combination of these RAID
levels can exist at the same time.
Configurable RAID stripe size: 64 KB, 128 KB, 256 KB, 512 KB, and 1 MB stripe
size per logical drive.
Background task priority tuning: Adjustment of minimum I/O reserved for server
use during all background tasks.
Hot spares: Multiple global or dedicated hot-spare drives with revert option.
Maximum LUNs per subsystem: 256 in any combination of RAID levels.
Maximum LUNs per array: 32 logical drives (LUNs). Supports LUN carving by
allowing an array to be divided into multiple logical drives. Supports out-of-order
logical drive deletion and re-creation.
Max LUNs per Target ID: Up to 64, depending on host side driver and operating
system.
LUN Masking and Mapping: Supports multiple hosts.
Disk Data Formats: Supports Disk Data Format (DDF) for industry-wide
standardization and drive roaming between VTrak systems.
Background Activities: Media Patrol, background synchronizing, disk array
rebuild, Redundancy Check, SMART condition pooling, Online Capacity
Expansion (OCE), RAID Level Migration (RLM). Includes priority control, rate
control, and watermarking per BGA in disk and NVRAM.
Foreground Activities: Disk array initialization.
Physical Drive Error Recovery: Predictive Data Migration (PDM), replaces un-
healthy disk member in array, while maintaining normal array status during the
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