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PERC 3/DC and PERC 3/DCL Features 71
SCSI Connectors
The PERC 3/DC and PERC 3/DCL adapter has two types of SCSI
connectors:
• Two 68-pin high density internal connectors
• Two 68-pin external ultra-high-density connectors
Only one connector type can be used for the SCSI channel at any one time.
SCSI Termination
PERC 3/DC and PERC 3/DCL uses active termination on the SCSI bus
conforming to SCSI-2 and SCSI-3 specifications. Termination
enable/disable is automatic through cable detection.
SCSI Firmware
The PERC 3/DC and PERC 3/DCL firmware handles all RAID and SCSI
command processing and supports the feature listed in Table 5-8.
Table 5-8. SCSI Firmware
Feature Description
Disconnect/
reconnect
Optimizes SCSI bus seek.
Tagged command
queuing
Multiple tags to improve random access
Scatter/gather A single command can transfer data to and from different
memory locations.
Multi-threading Up to 255 simultaneous commands with elevator sorting
and concatenation of requests per SCSI channel
Stripe size Variable for all logical drives: 2 KB, 4 KB, 8 KB, 16 KB,
32 KB, 64 KB, or 128 KB
Rebuild Multiple rebuilds and consistency checks with user-
definable priority