Drive Enclosure Wiring Diagrams
SAS cables establish the Backend SAS Interconnect of an Oracle FS System. SAS
cables connect Drive Enclosures to Drive Enclosures and the Controller SAS HBA
ports to the Drive Enclosure strings.
Usage Conventions for Cabling Drive Enclosure
The following usage conventions summarize how the ports are used when
cabling Drive Enclosures:
•
Controller 1 HBA ports 0 and ports 1 connect to the rst Drive Enclosure (I/
O module 0, port 0) in a string.
•
Controller 2 HBA ports 0 and ports 1 connect to the third Drive Enclosure
(I/O module 1, port 0) in strings that support three or more Drive
Enclosures.
•
Controller 2 HBA ports 0 and ports 1 connect to the second Drive
Enclosure (I/O module 1, port 0) or to the rst Drive Enclosure (I/O module
1, port 0) in strings that support less than three Drive Enclosures.
•
I/O module 0, port 1 connects to the second Drive Enclosure (I/O module 0,
port 0) and to the third Drive Enclosure (I/O module 0, port 0) in a string.
•
I/O module 1, port 2 connects to the fourth Drive Enclosure (I/O module 1,
port 0) and to the fth Drive Enclosure (I/O module 1, port 0) in a string.
Note: The Oracle FS System supports three hops from the HBAs.
Drive Enclosure String Distribution
Drive Enclosures are distributed among the strings so that all of the available
SAS HBA ports designated for Drive Enclosures are used as equally as possible.
The sequence of distributing strings is based on the performance capabilities of
the drives installed in the Drive Enclosures.
For optimal performance, rst distribute the Drive Enclosures with the highest
performance drives across the strings and then continue sequentially until all of
the Drive Enclosures are distributed to the strings. The number of Drive
Enclosures on the shortest string should not dier from the number Drive
Enclosures on the longest string by more than one Drive Enclosure.
The following table summarizes the string distribution for systems with one SAS
HBA per Controller. A system with one SAS HBA per Controller can have one to
10 Drive Enclosures distributed across two strings.
Wiring Diagrams
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