Dell 3 User Manual
Page 73
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.
Ta b l e 5 - 8 . S C S I F i r m w a r e
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