Users Guide

Table Of Contents
Read, Write, Cache And Disk Cache Policy Supported By PERC
Hardware Controllers
Table 46. Read, Write, and Cache Policy Supported by PERC Hardware Controllers
Read, Write, and
Cache Policy
PERC
H745P MX
PERC
H745
Frnt /
Adapter
PERC
H345
Frnt /
Adapter
PERC
H755 MX
PERC H755N PERC H755
Frnt/Adapter
PERC H840
Adapter
Cache settings Yes Yes Yes Yes Yes Yes Yes
Read Policy Yes Yes Yes Yes Yes Yes Yes
Read Ahead
(Enabled)
Yes Yes Yes Yes Yes Yes Yes
Adaptive Read
Ahead
No No No No No No No
No Read Ahead
(Disabled)
Yes Yes Yes Yes Yes Yes Yes
Write Policy Yes Yes Yes Yes Yes Yes Yes
Write Back
(Enabled)
Yes Yes Yes Yes Yes Yes Yes
Write Through
(Disabled)
Yes Yes Yes Yes Yes Yes Yes
Force Write Back
(Enabled Always)
Yes Yes Yes Yes Yes Yes Yes
Write Cache
Enabled Protected
No No No No No No No
Cache Policy No No No No No No No
Disk Cache Policy Yes Yes Yes Yes Yes Yes Yes
Cache I/O No No No No No No No
Direct I/O No No No No No No No
Supported Features On PERC H200 Controllers
This section identifies the controller-supported features and whether an enclosure can be attached to the controller.
Controller Tasks
Battery Tasks
Connector Tasks
Physical Disk Tasks
Virtual Disk Tasks
Virtual Disk Specifications
Supported RAID Levels
Read, Write, Cache And Disk Cache Policy
Enclosure Support
For enclosure-supported tasks, see Enclosure And Backplane Features.
168
Supported Features