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Date: Wed, 31 Mar 2004 14:21:10 -0500
From: Steve Shorter <steve@nomad.lets.net>
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Subject: Diskless machine - getdevs: error getting device stats
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Howdy!

	I have some diskless machines that boot using PXE and mount
data over NFS. They are truly diskless. When I run
vmstat (or similarly systat -vm) I get

	vmstat: getdevs: error getting device stats
	getdevs: Invalid argument

	Other  PXE booted machines that mount hard drives don't
exhibit this behavior. 

	On machines that don't mount hard drives 
the sysctl variable 

	kern.devstat.numdevs  = 0


	A ktrace on vmstat shows that a call to sysctl fails.

	What is to be done to be able to run vmstat and systat -vm?

	Or what are the consequences of this. if any?

	Freebsd-9-STABLE.

	thanx - steve