Date: Fri, 31 Jan 2003 20:58:27 +0100 From: phk@freebsd.org To: Julian Elischer <julian@elischer.org> Cc: Steve Byan <stephen_byan@maxtor.com>, freebsd-fs@freebsd.org, tech-kern@netbsd.org Subject: Re: DEV_B_SIZE Message-ID: <31671.1044043107@critter.freebsd.dk> In-Reply-To: Your message of "Fri, 31 Jan 2003 11:48:56 PST." <Pine.BSF.4.21.0301311144370.45015-100000@InterJet.elischer.org>
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In message <Pine.BSF.4.21.0301311144370.45015-100000@InterJet.elischer.org>, Ju lian Elischer writes: > > >One thign I thought of is that it is not uncommon to 'dd' an entire >filesystem from one partition to another. >If we create a filesystem that is 'aligned' and we copy it to be >'unalligned', we'd have a sudden performance drop for no immediatly >obvious reason. What was one write, would become a 2-sector read, >modify and 2-sector write. Especially when copying from one failing >drive to another with slightly different characteristics. If you run dd without bs=ALOT you deserve bad throughput. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message
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