# [OmniOS-discuss] Tips on diagnosing an OmniOS lockup?

Chris Siebenmann cks at cs.toronto.edu
Fri Sep 19 06:03:54 UTC 2014

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     We have a situation where one of our OmniOS NFS fileservers (running
    r151010 although not current on updates) is hanging/locking up
    mysteriously (other identical servers run fine). No messages are logged
    either to the console or to syslog and the machine becomes almost totally
    unresponsive; at best it pings, but input on the console is ignored and
    network services (including NFS) no longer respond.

     Beyond 'use mdb -K so we can capture a crash dump the next time this
    happens', do people have any suggestions for diagnosing the cause here?

     Thanks in advance.

    	- cks
    PS: if people want to know the hardware and setup details, this and
        its links are a description of the systems:
          http://utcc.utoronto.ca/~cks/space/blog/solaris/ZFSFileserverSetupII
        The fileserver systems are not currently using the LSI SAS ports for
        anything so I believe we should be unaffected by any OmniOS issues
        there.

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