Date: Sat, 29 Dec 2007 13:50:29 -0200 From: "Alexandre Biancalana" <biancalana@gmail.com> To: "Alfred Perlstein" <alfred@freebsd.org> Cc: freebsd-performance@freebsd.org Subject: Re: Bad performance when accessing a lot of small files Message-ID: <8e10486b0712290750i41ca2354q7baba9217a1fd9aa@mail.gmail.com> In-Reply-To: <20071228213851.GE76698@elvis.mu.org> References: <8e10486b0712191109n3d21b02cyf5183ee0cd01d8ce@mail.gmail.com> <20071221201625.GZ16982@elvis.mu.org> <8e10486b0712211249v4c5571ddud21b277f686992b2@mail.gmail.com> <20071221212808.GE16982@elvis.mu.org> <8e10486b0712211555n3efe8729qff14387be128cf10@mail.gmail.com> <20071222002535.GL16982@elvis.mu.org> <8e10486b0712251647uddf80f9sa6cacb42dfa94ff5@mail.gmail.com> <20071228213851.GE76698@elvis.mu.org>
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On Dec 28, 2007 7:38 PM, Alfred Perlstein <alfred@freebsd.org> wrote:
>
> * Alexandre Biancalana <biancalana@gmail.com> [071225 16:45] wrote:
> > On 12/21/07, Alfred Perlstein <alfred@freebsd.org> wrote:
> >
> > > Have you tried the 'noatime' mount option? That should help.
> >
> > Yeah, the zfs set atime=off was already done....
> >
> > >
> > > Can you provide a histogram of the count of files per directory?
> >
> > Excuse-me, but I don't understand....
>
> Distribution of files per directory, example:
>
> 1000 files in 9 dirs
> 1001 files in 12 dirs
>
> find /path_to_root/ -type f | sed 's/\/[^/]*$//' | uniq -c | \
> awk '{print $1}' | sort -n | uniq -c
>
> That will print out the number of files per dir.
>
> 2 98
> 3 102
> 1 103
> 2 105
Ohh yes !! Now I understand....
The problem is that last night the server stop responding and now is
panicing with the message:
ZFS(panic): zfs: allocating allocated segment(offset=2781261201408 size=131072)
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