Date: Tue, 07 Jul 2009 02:08:00 +0400 From: "Marat N.Afanasyev" <amarat@ksu.ru> To: Kostik Belousov <kostikbel@gmail.com> Cc: FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org> Subject: Re: bug in ufs? Message-ID: <4A5275C0.50607@ksu.ru> In-Reply-To: <20090706203427.GZ2884@deviant.kiev.zoral.com.ua> References: <4A50E947.9020608@ksu.ru> <4A523518.7050008@gmx.de> <4A523849.1070001@ksu.ru> <20090706193653.GU2884@deviant.kiev.zoral.com.ua> <4A525B72.1010808@ksu.ru> <20090706203427.GZ2884@deviant.kiev.zoral.com.ua>
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[-- Attachment #1 --]
Kostik Belousov wrote:
> 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.
is there any way to change this behavior? and i wonder why even if i can
create a reasonable number of small files i cannot create a slightly
larger file joining two unallocated parts of different blocks even if no
fully free block exists? ;)
--
SY, Marat
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