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Operating Systems AIX Crash dump and Panic message : RSCT Dead Man Switch Timeout for HACMP; halting non-responsive node Post 303042416 by zxmaus on Tuesday 24th of December 2019 01:08:46 AM
Old 12-24-2019
You lost all heartbeats from node 1 to node 2 - thats the reason for the crash. This might happen when your system is simply too busy - but since you should have both heartbeat on disk and heartbeat via network, you should think that there is time enough to send at least one every couple of seconds, Your cluster heartbeat settings might be too tight - giving it more time for the heartbeat might help preventing this issue in the future.
Just out of curiosity - using GPFS and HACMP and RAC on the same systems appears to me to be a completely unnecessary setup, as you are running essentially 3 different cluster products on a system when RAC alone would suffice. Why ?
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cr_open(3)						     Library Functions Manual							cr_open(3)

NAME
cr_open() - open crash dump for reading SYNOPSIS
DESCRIPTION
The library call opens a crash dump and passes back a crash dump descriptor. The path argument points to a path name naming a crash dump directory or file, and must not exceed bytes in length. The CRASH * to which crash_cb points is set to a crash dump descriptor, which can then be passed to the other functions to access the crash dump. flags is a bitmask of zero or more of the following flag values, which affect the operation of future calls to libcrash routines for this crash dump, except for cr_verify(3), which has its own flags parameter. The library will not attempt to verify checksums of files in the crash dump if this flag is set. The library will write messages to stderr during time-consuming operations (decompressions and checksums) if this flag is set. RETURN VALUE
Returns zero for success. Other possible return values are described in libcrash(5). EXAMPLES
The following call to opens crash dump contained in the directory and returns the crash dump descriptor For an example of reading the crash dump see the cr_read(3) manual entry. AUTHOR
was developed by HP. SEE ALSO
cr_close(3), cr_perror(3), libcrash(5). cr_open(3)
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