Dell MD3200i, MD3220i 3 Planning: RAID Controller Modules , 4 Planning: MD3200i Series Storage Array T erms and Concepts

4Contents
3 Planning: RAID Controller Modules. . . . 31
RAID Controller Modules . . . . . . . . . . . . . . . . 31
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
book.book Page 4 Wednesday, May 26, 2010 2:14 PM