Read Write Cache and Disk Cache Policy supported by the PERC software RAID controllers
| Read, Write, and Cache Policy | PERC S140 | PERC S150 | PERC S160 |
|---|---|---|---|
| Cache settings | Yes | Yes | Yes |
| Read Policy | Yes | Yes | Yes |
| Read Ahead (Enabled) | Yes | Yes | Yes |
| No Read Ahead (Disabled) | Yes | Yes | Yes |
| Write Policy | Yes | Yes | Yes |
| Write Back (Enabled) | Yes | Yes | Yes |
| Write Through (Disabled) | Yes | Yes | Yes |
| Force Write Back (Enabled Always) | No | No | No |
| Write Cache Enabled Protected | No | No | No |
| Disk Cache Policy | Yes | Yes | Yes |
| Cache I/O | No | No | No |
| Direct I/O | No | No | No |