Cmiou Redundancy - Oracle SPARC M8 Service Manual

CMIOU Redundancy

Server
Related Information
"Understanding Server Configurations and Failover Behavior" on page 79
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"CMIOU Configurations (SPARC M8-8 and SPARC M7-8 With Two
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PDomains)" on page 84
"CMIOU Configurations (SPARC M8-8 and SPARC M7-8 With One
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PDomain)" on page 85
"CMIOU Configurations (SPARC M7-16)" on page 85
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CMIOU Redundancy
When installed in the proper slots, CMIOUs are designed to provide redundant access to the
SP. Always install two CMIOUs in the first two slots of a SPARC M8-8 and SPARC M7-8
PDomain or a SPARC M7-16 DCU. Always follow these CMIOU configuration guidelines:
"CMIOU Configurations (SPARC M8-8 and SPARC M7-8 With Two
■
PDomains)" on page 84
"CMIOU Configurations (SPARC M8-8 and SPARC M7-8 With One
■
PDomain)" on page 85
"CMIOU Configurations (SPARC M7-16)" on page 85
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For example, ensure that there are CMIOUs installed in slots CMIOU_0 and CMIOU_1 in a SPARC
M8-8 server with one PDomain. In this example, if one of the CMIOUs has faulted, the
PDomain will still be able to access the SP through the other CMIOU.
If there is only one CMIOU is installed a PDomain or DCU, the communication link between
the SP and the PDomain will be lost if the CMIOU faults or is taken offline. For example, if a
SPARC M8-8 server with one PDomain contains one CMIOU installed in CMIOU_0, and that
CMIOU goes offline or faults, the communication link between the Active SP and the CMIOU
also goes down. In this example, the FMA fault information will not be synchronized between
the Active SP and the PDomain host, the prtdiag command will not display environmental
information, and the Oracle VM Server for SPARC software cannot save or read saved
configuration information saved on the SP. Additionally, if the boot pool devices are on the
CMIOU, the PDomain host might not be able to boot the Oracle Solaris OS.
88 SPARC M8 and SPARC M7 Servers Service Manual • September 2017
DCU No. (Top Supported CMIOUs
to Bottom)
DCU2 SPARC M7 CMIOUs only
DCU1 SPARC M7 CMIOUs only
DCU0 SPARC M7 CMIOUs only