Date: Mon, 18 May 2009 20:48:51 -0700 From: Tim Kientzle <kientzle@freebsd.org> To: Paul Wootton <paul@fletchermoorland.co.uk>, "'freebsd-current@freebsd.org'" <freebsd-current@freebsd.org> Subject: Re: discrepancies in used space after cpio Message-ID: <4A122C23.40603@freebsd.org> In-Reply-To: <4A1123C5.3070507@fletchermoorland.co.uk> References: <4A1123C5.3070507@fletchermoorland.co.uk>
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Paul Wootton wrote: > > I am currently in the process of moving all my data around, going from a > single zfs drive (ex-mirror) to a zfs raidz. > I have used cpio to copy the data to the new pool, but a du shows a big > difference in the results. > > Does anyone have any ideas, or does a "du -h ." not do what I think it > should? ... <snip> ... > > demophon# pwd > /DemoPool/var/tmp/kdecache-paul/kpc > demophon# ls -lah > total 1282522 > drwx------ 2 paul paul 25B May 15 19:35 . > drwx------ 11 paul paul 16B May 15 19:36 .. > -rw-r--r-- 1 paul paul 5.0M May 6 16:47 kapman_cache.data > -rw-r--r-- 1 paul paul 1.3M May 6 16:47 kapman_cache.index ... <snip> ... > demophon# du -h . > 1.2G . > > demophon# pwd > /var/tmp/kdecache-paul/kpc > demophon# ls -lah > total 7833 > drwx------ 2 paul paul 25B May 18 09:37 . > drwx------ 11 paul paul 16B May 18 09:12 .. > -rw-r--r-- 1 paul paul 5.0M May 6 16:47 kapman_cache.data > -rw-r--r-- 1 paul paul 1.3M May 6 16:47 kapman_cache.index ... <snip> ... > demophon# du -h . > 7.6M . Dmitry Morozovsky wrote: > Ehmm, possibly stupid question: sparse files? Dmitry's probably right here: Files .data/.index are probably some kind of database package, which are often highly sparse files. Try "du -k *" in each of these directories to see how much disk space is actually allocated to each file; that would verify that file sparseness is at issue here. Tim
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