Dell PowerEdge RAID Controller H800 - Manual (Page 4)

4 Contents
Consistency Checks . . . . . . . . . . . . . . . . . . . 26
Disk Roaming . . . . . . . . . . . . . . . . . . . . . . . 26
Disk Migration . . . . . . . . . . . . . . . . . . . . . . 27
Compatibility With Virtual Disks Created
on PERC 6 and H200 Cards
. . . . . . . . . . . . .
28
Migrating Virtual Disks From PERC 6 or
H200 to PERC H700 and H800
. . . . . . . . . . . .
28
Virtual Disk Write Cache Policies . . . . . . . . . . . . 29
Write-Back and Write-Through . . . . . . . . . . . 29
Conditions Under Which
Write-Back is Employed . . . . . . . . . . . . . . 29
Conditions Under Which
Write-Through is Employed . . . . . . . . . . . . . 30
Conditions Under Which Forced Write-Back
With No Battery is Employed . . . . . . . . . . . . 30
Virtual Disk Read Cache Policies . . . . . . . . . . . . 30
Reconfiguring Virtual Disks . . . . . . . . . . . . . . . 31
Fault Tolerance Features . . . . . . . . . . . . . . . . . 33
Using Persistent Hot Spare Slots
. . . . . . . . . .
34
Physical Disk Hot Swapping . . . . . . . . . . . . 34
Failed Physical Disk Detection . . . . . . . . . . . 34
Redundant Path With Load
Balancing Support . . . . . . . . . . . . . . . . . 35
Using Replace Member and
Revertible Hot Spares . . . . . . . . . . . . . . . . 35
Controller Cache Preservation . . . . . . . . . . . 36
Cache Preservation With Battery
. . . . . . . . . .
37
Cache Preservation With
Non-Volatile Cache (NVC)
. . . . . . . . . . . . .
37
Cache Data Recovery
. . . . . . . . . . . . . . . .
37
Battery Learn Cycle . . . . . . . . . . . . . . . . . 38
PERC7.2_UG.book Page 4 Thursday, March 3, 2011 2:14 PM