Date: Mon, 10 Oct 2016 14:06:41 +0200 From: Norbert Koch <nkoch@demig.de> To: <freebsd-hackers@FreeBSD.org> Subject: Why at least 4 cylinder groups? Message-ID: <b38d6452-fe18-aeb9-c176-f30fabd9b3f5@demig.de> In-Reply-To: <1454001217.1275.19.camel@freebsd.org> References: <56A9D502.7010809@demig.de> <1453995911.1275.14.camel@freebsd.org> <56AA42CF.10408@demig.de> <1454001217.1275.19.camel@freebsd.org>
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Hello. In an embedded system I am having a rather small (static) ram disk of about 1.5MB, formatted as UFS(1). Under FreeBSD 4 dumpfs shows me there is 1 cylinder group. Under FreeBSD 9 and 10 I see 4 cylinder groups. 4 is hard coded as the minimum value in ufs/ffs/fs.h. Why? Is there any technical reason not to have less than 4 cylinder groups? For my application the wasted 188KB make a difference. Thank you, Norbert Koch
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