Dell iDRAC6 User Manual page 296

The latter technique is useful in script programs, as it allows the script to
proceed after a new process is started for the iVMCLI command (otherwise,
the script would block until the iVMCLI program terminates).
When multiple iVMCLI instances are started in this way, and one or more of
the command instances must be manually terminated, use the operating
system-specific facilities for listing and terminating processes.
iVMCLI Return Codes
0 = No error
1 = Unable to connect
2 = iVMCLI command line error
3 = RAC firmware connection dropped
English-only text messages are also issued to standard error output whenever
errors are encountered.
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Deploying Your Operating System Using iVMCLI