> In what sense? Logging to syslog/email/external database and signing the Bringing machine to knees seems pretty intrusive to me. Samhain runs as deamon, and IIRC it scans running processes and does other things in effort to detect trojans and lkms. This activity used to boost idle load avg from ~0.1-0.3 to ~1.0, and created serious problems with handling peak loads. AFAIK you can modify the way you want to run samhain, and it's been years since I tried using samhain, so samhain probably became more efficient, and todays 6G-ram 3Ghz cpus probably pack enough grunt to safely ignore additional load, but one should always be carefull with 'extra features'.
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