Date: Sun, 07 Jan 2007 20:02:40 -0800 From: perryh@pluto.rain.com To: dgilbert@dclg.ca Cc: freebsd-hackers@freebsd.org Subject: Re: dump reads more than restore writes? Message-ID: <45a1c260./gHVPL2TJkCotGTS%perryh@pluto.rain.com> In-Reply-To: <17825.44456.556954.545497@canoe.dclg.ca> References: <17825.44456.556954.545497@canoe.dclg.ca>
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> Is dump reading substantially more than restore is writing? Quite possibly, esp. if the source disk is nowhere near full and/or most of the files being handled are small. dump reads every inode on the disk, including those which are unallocated, and probably reads entire data blocks -- or even entire FS blocks -- even when only part of the block contains useful data. Restore writes only what it has to.
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