Sun Microsystems SPARC Enterprise M8000 Product Notes page 25

Power cables are not redundant on single power feed servers without the dual
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power feed option. All power cables must be connected and powered on at all
times.
The use of the External I/O Expansion Unit to connect the host server to an
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external boot disk drive is not supported.
DR operations on an M8000/M9000 server might fail (with a misleading message
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regarding the board being unavailable for DR) after the addfru(8) or
replacefru(8) command have been used for active replacement. This happens
when the active replacement is done without the diagnostic test in the
maintenance menu. Execute the diagnosis in the maintenance menu of the
addfru(8) or replacefru(8) command to avoid this problem. To recover,
execute the testsb(8) command or delete the CPU/memory board unit using the
deletefru(8) command and then retry the addfru(8) command.
The setsnmp(8) and showsnmp(8) commands do not notify the user of
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authorization failure. Upon such failure, confirm that the SNMP trap host is
working and re-execute the command using the correct user name.
Chapter 1 Sun SPARC Enterprise M8000/M9000 Servers Product Notes for XCP 1091 13