4 Contents
RAID Controller Module Connectors and Features . . . 32
RAID Controller Module—Additional Features
. . . . . 34
Battery Backup Unit
. . . . . . . . . . . . . . . . 34
Storage Array Thermal Shutdown
. . . . . . . . . 34
System Password Reset
. . . . . . . . . . . . . . 35
Cache Functions and Features
. . . . . . . . . . . . . . 35
Cache Mirroring
. . . . . . . . . . . . . . . . . . . 35
Write-Back Cache
. . . . . . . . . . . . . . . . . 35
Write-Through Cache. . . . . . . . . . . . . . . . 36
4 Planning: MD3200i Series Storage Array Terms
and Concepts . . . . . . . . . . . . . . . . . . . . . 37
Physical Disks, Virtual Disks, and Disk Groups . . . . . 37
Physical Disks
. . . . . . . . . . . . . . . . . . . . 37
Physical Disk States
. . . . . . . . . . . . . . . . 38
Self-Monitoring Analysis and Reporting Technology
39
Virtual Disks and Disk Groups . . . . . . . . . . . 39
Virtual Disk States
. . . . . . . . . . . . . . . . . 40
RAID Levels
. . . . . . . . . . . . . . . . . . . . . . . . 40
RAID Level Usage
. . . . . . . . . . . . . . . . . . 41
Segment Size. . . . . . . . . . . . . . . . . . . . . . . 42
Virtual Disk Operations
. . . . . . . . . . . . . . . . . 43
Virtual Disk Initialization
. . . . . . . . . . . . . . 43
Background Initialization
. . . . . . . . . . . . . . 43
Foreground Initialization . . . . . . . . . . . . . . 43
Consistency Check
. . . . . . . . . . . . . . . . . 44
Media Verification
. . . . . . . . . . . . . . . . . 44
Cycle Time. . . . . . . . . . . . . . . . . . . . . . 44
Virtual Disk Operations Limit
. . . . . . . . . . . . 45