Date: Thu, 27 Jan 2011 22:20:11 +0200 From: Alexander Motin <mav@FreeBSD.org> To: Warner Losh <imp@FreeBSD.org> Cc: svn-src-projects@freebsd.org, src-committers@FreeBSD.org Subject: Re: svn commit: r217972 - projects/graid/head/sys/geom/raid Message-ID: <4D41D37B.2040907@FreeBSD.org> In-Reply-To: <201101271956.p0RJuG0f033255@svn.freebsd.org> References: <201101271956.p0RJuG0f033255@svn.freebsd.org>
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On 27.01.2011 21:56, Warner Losh wrote: > (3) Update metadata after each bundle of slabs. (mav: please comment on > frequency) I would do it once for every few minutes or few percents or some comparable number of gigabytes. Doing it more often is pointless, while it may significantly affect performance, as metadata write is synchronous now. gmirror does it every MAXPHYS * 100 bytes, but I would say that doing it every 12.8MB is too often for modern HDDs speeds. -- Alexander Motin
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