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Date:      Mon, 12 Jan 2009 21:53:22 -0500
From:      Yoshihiro Ota <ota@j.email.ne.jp>
To:        Christoph Mallon <christoph.mallon@gmx.de>
Cc:        ota@j.email.ne.jp, hackers@freebsd.org
Subject:   Re: gcache [was: Re: 3x read to write ratio on dump/restore]
Message-ID:  <20090112215322.1c284010.ota@j.email.ne.jp>
In-Reply-To: <496B1E47.1030403@gmx.de>
References:  <20090109.095027.-1672857892.imp@bsdimp.com> <20090111041710.GB5661@server.vk2pj.dyndns.org> <20090112050537.f423215c.ota@j.email.ne.jp> <496B1E47.1030403@gmx.de>

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On Mon, 12 Jan 2009 11:41:11 +0100
Christoph Mallon <christoph.mallon@gmx.de> wrote:

> Yoshihiro Ota schrieb:
> > Try GEOM Cache(gcache).
> 
> Just a side note: gcache does not seem to have any documentation. "man 
> gcache" is unsuccessful, geom(8) does not mention it (geom and gcache 
> are the same hardlinked binary). Is there information about it somewhere?

The CVS log was the best document available I took a look back in one year ago:
http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/geom/cache/g_cache.h?rev=1.1


About the link, it is also true for many other providors, too.
That is based on how GEOM library were implemented and so on.

% ls -i /sbin/g*
590 /sbin/gbde          495 /sbin/ggatel        520 /sbin/gpt
592 /sbin/gcache        592 /sbin/gjournal      592 /sbin/graid3
592 /sbin/gconcat       592 /sbin/glabel        524 /sbin/growfs
592 /sbin/geli          592 /sbin/gmirror       592 /sbin/gshsec
592 /sbin/geom          592 /sbin/gmultipath    592 /sbin/gstripe
258 /sbin/ggatec        592 /sbin/gnop          528 /sbin/gvinum
440 /sbin/ggated        592 /sbin/gpart         592 /sbin/gvirstor

Hiro



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