Date: Mon, 17 Dec 2012 16:44:11 -0500 From: "Dieter BSD" <dieterbsd@engineer.com> To: freebsd-fs@freebsd.org,freebsd-performance@freebsd.org Subject: FFS - Still using rotational delay with modern disks? Message-ID: <20121217214413.263570@gmx.com>
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The newfs man page says: -a maxcontig Specify the maximum number of contiguous blocks that will be laid out before forcing a rotational delay. The default value is 16. See tunefs(8) for more details on how to set this option. Is this still a good idea with modern drives where the number of sectors per track varies, and no one but the manufacturer knows how many sectors a particular track has? [1] Skipping sectors could unnecessarily force a seek to the next track, thus hurting rather than helping performance. I have to wonder if FreeBSD even supports any hard drives that don't use zone bit recording? The tunefs man page does not mention this parameter. [1] http://en.wikipedia.org/wiki/Zone_bit_recording
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