06-17-2011
Disk space just sits there, it doesn't do anything. It can't slow the server down unless it actually uses it.
I take it you have a performance problem in your server.
If it's a straightforward problem of the hardware being simply insufficient, you still have to figure out which straightforward problem it is.
Not enough CPU power? Faster CPU or, if the application and hardware supports it, more CPU cores. Not enough disk speed? Faster disks, or more disks RAIDed in a more parallel manner, or reconfigure your filesystem/application to work more optimally. Not enough memory? More memory.
It might
not be a hardware problem for all we know, though. Can you give us more details on what's happening?
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LEARN ABOUT FREEBSD
pmccontrol
PMCCONTROL(8) BSD System Manager's Manual PMCCONTROL(8)
NAME
pmccontrol -- control hardware performance monitoring counters
SYNOPSIS
pmccontrol [-c cpu | -d pmc | -e pmc] ...
pmccontrol -l
pmccontrol -L
pmccontrol -s
DESCRIPTION
The pmccontrol utility controls the operation of the system's hardware performance monitoring counters.
OPTIONS
The pmccontrol utility processes options in command line order, so later options modify the effect of earlier ones. The following options
are available:
-c cpu Subsequent enable and disable options affect the CPU denoted by argument cpu. The argument cpu is a number denoting a CPU in the
system, or ``*'', denoting all unhalted CPUs in the system.
-d pmc Disable PMC number pmc on the CPU specified by -c, preventing it from being used till subsequently re-enabled. The argument pmc is a
number denoting a specific PMC, or ``*'' denoting all the PMCs on the specified CPU.
Only idle PMCs may be disabled.
-e pmc Enable PMC number pmc, on the CPU specified by -c, allowing it to be used in the future. The argument pmc is a number denoting a
specific PMC, or ``*'' denoting all the PMCs on the specified CPU. If PMC pmc is already enabled, this option has no effect.
-l List available hardware performance counters and their current disposition.
-L List available hardware performance counter classes and their supported event names.
-s Print driver statistics maintained by hwpmc(4).
EXAMPLES
To disable all PMCs on all CPUs, use the command:
pmccontrol -d*
To enable all PMCs on all CPUs, use:
pmccontrol -e*
To disable PMCs 0 and 1 on CPU 2, use:
pmccontrol -c2 -d0 -d1
To disable PMC 0 of CPU 0 only, and enable all other PMCS on all other CPUs, use:
pmccontrol -c* -e* -c0 -d0
DIAGNOSTICS
The pmccontrol utility exits 0 on success, and >0 if an error occurs.
SEE ALSO
pmc(3), pmclog(3), hwpmc(4), pmcstat(8), sysctl(8)
HISTORY
The pmccontrol utility first appeared in FreeBSD 6.0.
AUTHORS
Joseph Koshy <jkoshy@FreeBSD.org>
BSD
November 9, 2008 BSD