Dell PowerVault MD3220 - Manual (Page 4)

4 Contents
RAID Controller Module Connectors
and Features
. . . . . . . . . . . . . . . . . . . . . . . 32
RAID Controller Module—Additional Features . . . . . 34
Battery Backup Unit . . . . . . . . . . . . . . . . 34
Storage Array Thermal Shutdown . . . . . . . . . 35
System Password Reset . . . . . . . . . . . . . . 35
Cache Functions and Features . . . . . . . . . . . . . . 36
Cache Mirroring
. . . . . . . . . . . . . . . . . . .
36
Write-Back Cache
. . . . . . . . . . . . . . . . .
36
Write-Through Cache . . . . . . . . . . . . . . . . 36
4 Planning: MD3200 Series Storage
Array Terms and Concepts
. . . . . . . . . . .
37
Physical Disks, Virtual Disks, and Disk Groups . . . . . 37
Physical Disks
. . . . . . . . . . . . . . . . . . . .
38
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 . . . . . . . . . . . . . . . . . . . . . . . 43
Virtual Disk Operations . . . . . . . . . . . . . . . . . 43
Virtual Disk Initialization
. . . . . . . . . . . . . .
43
Background Initialization
. . . . . . . . . . . . . .
43
Foreground Initialization . . . . . . . . . . . . . . 43
Consistency Check . . . . . . . . . . . . . . . . . 44
Media Verification . . . . . . . . . . . . . . . . . 44
book.book Page 4 Tuesday, June 18, 2013 2:53 PM