Special Considerations For Cable Routing - Western Digital Ultrastar Data102 Installation Manual

Installation Guide
Length
3m
As a best practice, Western Digital requires connecting the cables to every other SAS connector port
when connecting more than one host per IOM. Please refer to
Connection Order (page 63)
Table 35: Recommended IOM Port Connection Order
IOM
A
B
Edge Buffering
Edge buffering is an enclosure feature that increases the overall performance when a 6Gb/s target is
connected. With edge buffering disabled, primitives that can be deleted from the initiator are added to
slow the effective logical rate to the slowest target device connected between the initiator and the target
device. With edge buffering enabled, the expanders buffer data from slower 6Gb/s targets to utilize the
12Gb/s link from the expander to the initiator in a more efficient manner.
5.6.2 Special Considerations for Cable Routing
There are a number of special considerations installers should take when routing cables through the CMA.
This section outlines those considerations.
The distance from the end of the connector at the port to the first basket on the CMA should be 20" – 21"
long. This will give the cables enough slack at this end to prevent stress on the port and binding during
operation cycles.
Manufacturer
CS Electronics
Data Storage Cables (DSC)
Molex
The Mate Company (TMC)
Amphenol ICC (FCI)
CS Electronics
Molex
for port connection ordering required for IOMA and IOMB:
1st Host 2nd Host
Ports Ports
A6 A4
B1 B3
Table 35: Recommended IOM Port
3rd Host 4th Host
Ports Ports
A2 A5
B5 B2
5. Installation
5.6 Cable Installation
Vendor Part Number
10117949-2020LF
12G-HD-4444/2M
C5555-2M
1110751002
C5555-2M
601760008
10117949-4030LF
12G-HD-4444/3M
1110751003
5th Host 6th Host
Ports Ports
A3 A1
B4 B6
63