[Gluster-users] Writing is slow when there are 10 million files.
Liam Slusser
lslusser at gmail.com
Tue Apr 15 18:54:46 UTC 2014
Our application also stores the path of the file in a database. Accessing
a file directly is normally pretty speedy. However, to get the files into
the database required searching parts of the filesystem which was really
slow. We also had users using the filesystem fixing things which was all
unix shell ls/cp/mv etc, and again, really slow.
And the biggest problem I had was if one of the nodes went down for a
reboot/patching/whatever, to "resync" the filesystems took weeks because of
the huge number of files.
thanks,
liam
On Tue, Apr 15, 2014 at 3:15 AM, Terada Michitaka <terrada3 at gmail.com>wrote:
> >> To Liam:
>
> >I had about 100 million files in Gluster and it was unbelievably
> painfully slow. We had to ditch it for other technology.
>
> Has slow down occurred on writing file?, listing files, or both?
>
> In our application, path of the data is managed in database.
> "ls" is slow, but not influence to my application, but writing file slow
> down is critical.
>
> >> To All:
>
> I uploaded a statistics when writing test(32kbyte x 10 million, 6 bricks).
>
> http://gss.iijgio.com/gluster/gfs-profile_d03r2.txt
>
> Line 15, average-latency value is about 30 ms.
> I cannot judge this value is a normal(ordinary?) performance or not.
>
> Is it slow?
>
> Thanks,
> --Michika Terada
>
>
>
>
> 2014-04-15 16:05 GMT+09:00 Franco Broi <franco.broi at iongeo.com>:
>
>
>> My bug report is here
>> https://bugzilla.redhat.com/show_bug.cgi?id=1067256
>>
>> On Mon, 2014-04-14 at 23:51 -0700, Joe Julian wrote:
>> > If you experience pain using any filesystem, you should see your
>> > doctor.
>> >
>> > If you're not actually experiencing pain, perhaps you should avoid
>> > hyperbole and instead talk about what version you tried, what your
>> > tests were, how you tried to fix it, and what the results were.
>> >
>> > If you're using a current version with a kernel that has readdirplus
>> > support for fuse it shouldn't be that bad. If it is, file a bug report
>> > - especially if you have the skills to help diagnose the problem.
>> >
>> > On April 14, 2014 11:30:26 PM PDT, Liam Slusser <lslusser at gmail.com>
>> > wrote:
>> >
>> > I had about 100 million files in Gluster and it was
>> > unbelievably painfully slow. We had to ditch it for other
>> > technology.
>> >
>> >
>> > On Mon, Apr 14, 2014 at 11:24 PM, Franco Broi
>> > <franco.broi at iongeo.com> wrote:
>> >
>> > I seriously doubt this is the right filesystem for
>> > you, we have problems
>> > listing directories with a few hundred files, never
>> > mind millions.
>> >
>> > On Tue, 2014-04-15 at 10:45 +0900, Terada Michitaka
>> > wrote:
>> > > Dear All,
>> > >
>> > >
>> > >
>> > > I have a problem with slow writing when there are 10
>> > million files.
>> > > (Top level directories are 2,500.)
>> > >
>> > >
>> > > I configured GlusterFS distributed cluster(3 nodes).
>> > > Each node's spec is below.
>> > >
>> > >
>> > > CPU: Xeon E5-2620 (2.00GHz 6 Core)
>> > > HDD: SATA 7200rpm 4TB*12 (RAID 6)
>> > > NW: 10GBEth
>> > > GlusterFS : glusterfs 3.4.2 built on Jan 3 2014
>> > 12:38:06
>> > >
>> > > This cluster(volume) is mounted on CentOS via FUSE
>> > client.
>> > > This volume is storage of our application and I want
>> > to store 3
>> > > hundred million to 5 billion files.
>> > >
>> > >
>> > > I performed a writing test, writing 32KByte file ×
>> > 10 million to this
>> > > volume, and encountered a problem.
>> > >
>> > >
>> > > (1) Writing is so slow and slow down as number of
>> > files increases.
>> > > In non clustering situation(one node), this node's
>> > writing speed is
>> > > 40 MByte/sec at random,
>> > > But writing speed is 3.6MByte/sec on that cluster.
>> > > (2) ls command is very slow.
>> > > About 20 second. Directory creation takes about 10
>> > seconds at
>> > > lowest.
>> > >
>> > >
>> > > Question:
>> > >
>> > > 1)5 Billion files are possible to store in
>> > GlusterFS?
>> > > Has someone succeeded to store billion files to
>> > GlusterFS?
>> > >
>> > > 2) Could you give me a link for a tuning guide or
>> > some information of
>> > > tuning?
>> > >
>> > > Thanks.
>> > >
>> > >
>> > > -- Michitaka Terada
>> >
>> > > _______________________________________________
>> > > Gluster-users mailing list
>> > > Gluster-users at gluster.org
>> > >
>> >
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>> >
>> >
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>> >
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>> >
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>>
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