RE: [logs] High Network Load

From: Brown, James (Jim) (JBrownat_private)
Date: Fri Sep 19 2003 - 07:32:45 PDT

  • Next message: Marcus J. Ranum: "Re: [logs] High Network Load"

    Your concerns about packet flow and whether packets are being 
    dropped in transit or on the host OS can be answered with
    SNMP monitoring.  All modern routers and switches keep SNMP statistics
    for full buffers, packet discard rates and other similar conditions.
    Most OS's keep similar data.  
    Because SNMP monitoring can itself be traffic intensive, if you can 
    devise an out-of-band solution for collection and monitoring you
    will be better off in the long run.
    Best Regards,
    Jim Brown, ThruPoint
    -----Original Message-----
    From: Philip Webster
    To: loganalysisat_private
    Sent: 9/18/03 7:59 PM
    Subject: [logs] High Network Load
    I'm implementing a central log server over a large class B network, and 
    have chosen syslog-ng as the server.  One of syslog-ng's features is 
    that it can report the number of messages dropped internally, usually 
    through either the receive or write buffers not being large enough. 
    These values can be tweaked, and at least you know when there is 
    something going wrong.
    But what if the OS kernel drops the message?  Does anyone here have any 
    experience with the OS losing messages before they get to the syslogd 
    process?  How can this be monitored and overcome?
    The server (Red Hat Advanced Server) will be accepting logs over both 
    UDP and TCP (and possibly via SSH port forwarding and/or stunnel), 
    sitting on a 100Mb connection, and may potentially have hundreds of 
    machines logging to it, as well as routers, switches, and several very 
    high volume proxy servers.
    Any thoughts?
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