User's Manual

Supported Features 313
Read, Write, and Disk Cache Policy
Table A-8. Read, Write and Disk Cache Policy Supported by the PERC 4/ Controllers
Read, Write, and
Disk Cache
Policy
PERC
4/SC
PERC
4/DC
PERC
4/DI
PERC
4e/SI
PERC
4e/DI
PERC
4e/DC
PERC
4/IM
Cache settings Yes Yes Yes Yes Yes Yes No
Read Policy Yes Yes Yes Yes Yes Yes No
Read Ahead
(Enabled)
Yes Yes Yes Yes Yes Yes No
Adaptive Read
Ahead
Yes Yes Yes Yes Yes Yes No
No Read Ahead
(Disabled)
Yes Yes Yes Yes Yes Yes No
Write Policy Yes Yes Yes Yes Yes Yes No
Write Back
(Enabled)
Yes Yes Yes Yes Yes Yes No
Write Through
(Disabled)
Yes Yes Yes Yes Yes Yes No
Force Write
Back (Enabled
Always)
No No No No No No No
Write Cache
Enabled
Protected
No No No No No No No
Disk Cache
Policy
Yes Yes Yes Yes Yes Yes No
Cache I/O Yes Yes Yes Yes Yes Yes No
Direct I/O Yes Yes Yes Yes Yes Yes No