Two internal and four external connectors for the PERC 3/QC, two internal and two external connectors for the PERC 3/DC and PERC 3/DCL, and one internal and one external connector for the PERC 3/SC

RAID levels 0 (striping), 1 (mirroring), 5 (distributed parity), 10 (combination of striping and mirroring), and 50 (combination of striping and distributed parity)

Advanced array configuration and management utilities

Battery backup for up to 72 hours for the PERC 3/QC and PERC 3/DC

Up to 12 SCSI drives per channel using the Dell PowerVault 21xS storage system or 14 SCSI drives using the Dell PowerVault 22xS

SCSI Channels

The PERC 3/QC controller card includes four SCSI channels. There are two QLogic®12160 chips; each chip controls two SCSI channels.

The PERC 3/DC and PERC 3/DCL controller cards include two SCSI channels. There is one QLogic 12160 chip, which controls two SCSI channels.

The PERC 3/SC controller card has one SCSI channel. There is one QLogic 10160 chip.

Non-volatile Random Access Memory (NVRAM) and Flash Read- only Memory (ROM)

A 32 KB x 8 NVRAM stores RAID system configuration information. The PERC 3 firmware is stored in flash ROM for easy upgrade.

SCSI Connectors

PERC 3/QC has four ultra-high-density 68-pin external connectors for the external storage subsystem and two high-density 68-pin internal connectors.

PERC 3/DC and PERC 3/DCL have two ultra-high-density 68-pin external connectors for the external storage subsystem and two high-density 68-pin internal connectors.

NOTE: Clustering is not supported by PERC 3/QC or PERC 3/DCL.

Over view

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Dell 3 manual Scsi Channels, Scsi Connectors