Date: Thu, 22 Mar 2007 14:39:33 +0100 From: Ivan Voras <ivoras@fer.hr> To: freebsd-performance@freebsd.org Subject: Re: Slow on heavy I/O operations. Message-ID: <etu0u5$67q$1@sea.gmane.org> In-Reply-To: <1465093066.20070322162026@gmail.com> References: <1036039198.20070321153412@gmail.com> <200703211354.l2LDsKnV080911@lurza.secnetix.de> <1465093066.20070322162026@gmail.com>
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Roman Gorohov. wrote: > But what I can't understand - why such non-critical(as it seems to me) disk activity, > cause 100% busyness for disk? Its claim to be 40.000MB/s transfers, but > sometimes its 100% busy when iostat show only 1 MB/s. Because disk seeks count. If you have a lot of small transactions that need seeks they'll kill performance (try running "find /" - you'll get ~500 kB/s rate and 100% busy disks).
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