Date: Tue, 10 Jul 2007 06:20:47 -0700 (PDT) From: Gore Jarold <gore_jarold@yahoo.com> To: bv@wjv.com Cc: freebsd-fs@freebsd.org Subject: Re: help needed - tuning a filesystem for rm and cp ? (MORE) Message-ID: <774173.69403.qm@web63007.mail.re1.yahoo.com> In-Reply-To: <20070710124050.GA2184@wjv.com>
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--- Bill Vermillion <bv@wjv.com> wrote:
> > All else being equal, how do you optimize a system
> for
> > copying from one place to another on the same
> mount
> > point ? How do you optimize a system for fast
> file
> > deletion ? Are the two mutually exclusive ?
>
> I've not done this recently as I've not had to, but
> when
> you need to move files from one place to another
> >on the same
> filesystem< you don't have to copy them.
>
> Use cpio with the -pdlm arguments. This will make
> hard links
> from the original file locations to the new file
> location.
> Then you can just 'rm' the original directory
> entries and the
> new directory will be running just as the old one.
>
> -p is passthrough, -d makes directories as needed,
> -l make links
> but you must use the -p option, and -v is verbose.
> I always
> run this way as I like to see just exactly what is
> going on.
>
> The big upside of this is that you only build
> directories and
> it does NOT move the files themselves. Thus both
> the build new
> directory and remove the old directories are going
> to be much
> faster than copying files.
>
> It can be quite fast. Just checking the man pages
> for
> FreeBSD's cpio, I see the flags have greatly
> expanded, as I used to
> just use the -pdlm flags on System V.3 systems I was
> running.
> You may have to go thorugh manual carefuly to make
> sure of
> the flags.
Yes - this is exactly what I do for the copies. I
already do exactly as you describe.
So perhaps there is no further system tuning or
optimization that can be done for my copy processes ?
What about my 'rm' processes - is there any way to
optimize/tune a system to do very fast file deletions ?
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