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SCSI Bus
MegaRAID Express 500 has a Fast and Wide Ultra 160M SCSI channel that supports
both LVD and single-ended devices with active termination. Synchronous and
asynchronous devices are supported. MegaRAID Express 500 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. MegaRAID Express 500 supports up to six non-disk devices per controller.
SCSI Connectors
MegaRAID Express 500 has two types of SCSI connectors:
•
a 68-pin high density internal connector
•
a 68-pin external ultra-high-density connector
Both connector types can be used for the SCSI channel.
SCSI Termination
MegaRAID Express 500 uses active termination on the SCSI bus conforming to
Alternative 2 of the SCSI-2 specifications. Termination enable/disable is automatic
through cable detection.
SCSI Firmware
The MegaRAID Express 500 firmware handles all RAID and SCSI command processing
and also supports:
Feature
Disconnect/
Reconnect
Tagged Command
Queuing
Scatter/Gather
Multi-threading
Stripe Size
Rebuild
34
MegaRAID Express 500 Hardware Guide
Description
Optimizes SCSI Bus seek.
Multiple tags to improve random access
Multiple address/count pairs
Up to 255 simultaneous commands with elevator sorting and
concatenation of requests per SCSI channel
Variable for all logical drives: 2 KB, 4 KB, 8 KB, 16 KB, 32
KB, 64 KB, or 128 KB.
Multiple rebuilds and consistency checks with user-
definable priority.
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