Date: Mon, 6 Jul 2009 23:34:27 +0300 From: Kostik Belousov <kostikbel@gmail.com> To: "Marat N.Afanasyev" <amarat@ksu.ru> Cc: Ralf Folkerts <ralf.folkerts@gmx.de>, FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org> Subject: Re: bug in ufs? Message-ID: <20090706203427.GZ2884@deviant.kiev.zoral.com.ua> In-Reply-To: <4A525B72.1010808@ksu.ru> References: <4A50E947.9020608@ksu.ru> <4A523518.7050008@gmx.de> <4A523849.1070001@ksu.ru> <20090706193653.GU2884@deviant.kiev.zoral.com.ua> <4A525B72.1010808@ksu.ru>
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[-- Attachment #1 --] On Tue, Jul 07, 2009 at 12:15:46AM +0400, Marat N.Afanasyev wrote: > Kostik Belousov wrote: > >On Mon, Jul 06, 2009 at 09:45:45PM +0400, Marat N.Afanasyev wrote: > >>i have a huge amount of small files on the source systems, as you can > >>see they have about 20 million files and almost each of them is jpeg or > >>gif. afaik, there are no sparse files at all. > >> > >>i still cannot figure out what is it: a free space leak in ufs2+su or > >>bug in statfs(3), that is used in df, or something else. > > > >My guess that it is due to fragmentation. > >As an experiment, try to create 1-byte file. Does it work on the filesystem > >in described state ? > > I can create small files, as many as i have patience, maximum size of > such "small file" is 14336, so. it seems that if file is no greater than > (block_size-2048) it can be created. larger file cannot be created. > > imho, fragmentation on filesystem should be very low, there were no > deletions on it, just creations. The fragmentation on UFS usually means using fragments for the file tails, not having file sequential blocks allocated in the non-sequential disk blocks. You experiment confirms my hypothesis. [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (FreeBSD) iEYEARECAAYFAkpSX9MACgkQC3+MBN1Mb4jgygCeMmOgxVzrTPkVoxCnKl+sjtVV TogAnj27rBmc12PpsGwfcvZiIuPWo9iH =9SPE -----END PGP SIGNATURE-----
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