B-16
SPARC Enterprise M8000/M9000 Servers Service Manual • October 2012
FIGURE B-9
Crossbar Unit (XBU_B)
The XBU has the following characteristics.
■
Only cold replacement is available for the XBU.
■
In the M9000 server (with an expansion cabinet) model, control over the expansion
cabinet is done by connecting the XBUs of both base cabinet and expansion cabinet with
cables.
■
The XBU has a normal mode and a degraded mode. In normal mode, all eight sets
operate; and in degraded mode in which a failure has occurred, the four sets containing
the failed set are disconnected, and operation continues with the remaining four normal
sets. If an XB fails, the system is shut down to disconnect the four sets including the
failed XB, and it is then automatically recovered.
■
A dedicated LSI chip is used for the crossbar switch (XB).
■
For the bus connecting CMU and XBU, a high-speed link is used.
■
For the bus connecting the IOU and XBU and the bus connecting XBUs of the base
cabinet and expansion cabinet, a high-speed link is being used.
■
The XBU has a label bearing the printed component number and manufacture's serial
number.
Summary of Contents for SPARC Enterprise M8000
Page 4: ......
Page 15: ...Contents xv Index Index 1 ...
Page 16: ...xvi SPARC Enterprise M8000 M9000 Servers Service Manual October 2012 ...
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Page 27: ...Chapter 1 Safety and Tools 1 5 M9000 Server Front View ...
Page 29: ...Chapter 1 Safety and Tools 1 7 Power Supply Unit PSU ...
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Page 205: ...Chapter 7 I O Unit IOU Replacement 7 13 FIGURE 7 8 Removing the IOU Front of M9000 1 1 2 3 ...
Page 227: ...Chapter 8 FAN Unit Replacement 8 11 FIGURE 8 9 Removing the FAN Unit Rear of M8000 1 2 ...
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Page 409: ...Chapter 20 Backplane Replacement 20 29 FIGURE 20 16 Removing the FANBP Rear of the M8000 ...
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Page 439: ...Chapter 23 Switch Backplane Replacement 23 7 FIGURE 23 4 Removing the SWBP Rear of the M8000 ...
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