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70 PERC 3/DC and PERC 3/DCL Features
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Cache Memory
Either 64 MB or 128 MB of PERC 3/DC and PERC 3/DCL cache memory
reside in a memory bank that uses a 64 MB or 128 MB SDRAM DIMM.
PERC 3/DC and PERC 3/DCL support write-through or write-back
caching, selectable for each logical drive. To improve performance in
sequential disk accesses, the PERC 3/DC and PERC 3/DCL controllers use
read-ahead caching by default. You can disable read-ahead caching.
PERC 3/DC and PERC 3/DCL BIOS
The BIOS resides on a 1 MB × 8 flash ROM for easy upgrade. The PERC
3/DC and PERC 3/DCL BIOS supports INT 13h calls to boot DOS without
special software or device drivers. The PERC 3/DC and PERC 3/DCL BIOS
provides an extensive setup utility that can be accessed by pressing <Ctrl>
<M> at BIOS initialization. PERC 3/DC and PERC 3/DCL BIOS
Configuration utility is described in Chapter 11 "PERC 3 BIOS
Configuration Utility."
Onboard Speaker
The PERC 3/DC and PERC 3/DCL controller has an onboard tone
generator for audible warnings when system errors occur. Audible warnings
can be generated through this speaker. The audible warnings are listed in
Chapter 13 "Troubleshooting."
Serial Port
PERC 3/DC and PERC 3/DCL includes a 3-pin RS232C-compatible serial
port connector. This is for manufacturing use only.
SCSI Bus
The PERC 3/DC and PERC 3/DCL controller has four Wide 160M SCSI
channels that support both LVD and single-ended devices with active
termination. Synchronous and asynchronous devices are supported. PERC
3/DC and PERC 3/DCL provides automatic termination disable via cable
detection. The SCSI channel supports up to 15 wide or seven non-wide
SCSI devices at speeds up to 160 MB/s.