[Gluster-users] Very poor performance - 2 Peers, 500KB = 14 Seconds

[Paul Robert Marino]

this sounds like it may be any number of issues.
With out more information about your hardware, configuration, and the
version of Gluster you are using its hard to say with any certainty
what the problem could be.
I would start with looking at the network interfaces to see if they
are getting saturated or having any issues my self.
tools like netcat, and iftop should be useful for figuring out if your
network is performing well.
Then I might start looking at the ram to see if the box is swapping
which might cause IO wait, and there are still many other
possibilities.





On Fri, Sep 27, 2013 at 6:21 PM, Michael Post <michael_post at web.de> wrote:
> Hello together,
>
> very interesting.
>
> i switched to xfs filesystem. But same situation. For my proposes both
> filesystems are perfect fast.
>
> Then i did a benchmark with command 'dd'
>
> Tried with 'dd if=/dev/zero of=/share/mounted_glustered_dir/test.img bs=1M
> count=1000'.
>
> Perfect write speed! Also at the replicated peer.
>
> 500MB in perfect less than 10 Seconds, also at the replicated peer.
>
> But when i copy many files from a to mounted glustered dir, then the write
> speed broke into KB-Range.
>
> Any clue what this can be?
>
> Thanks a lot,
>
> Michael
>
> Am 27.09.2013 um 22:24 schrieb Michael Post <michael_post at web.de>:
>
> Hallo,
>
> i looked at iotop.
>
> One file will be written (Average Speed 250k/s). After the file is written
> nothing happens for 1 or 2 seconds. Then the next procedure for writing will
> be started.
> The cpu is idle and very bored.
>
> Does any one has any clue for me?
>
> Hopeful greetings,
>
> Michael
>
>
>
> Am 27.09.2013 um 21:17 schrieb Michael Post <michael_post at web.de>:
>
> Hello together,
>
> i installed gluster (Version glusterfs 3.4.0qa2) on an opensuse 12.3
> environment. Based on an ext4 filesystem i created a two peer (geo
> replication) environment.
>
> When i copy some files, the performance is very slow.
> For 500KB the system need between 14 till 20 seconds.
>
> This can not be normal, or?
>
> A previous test, but on two debian wheezy systems all works fast and fine.
>
> Where can i analyze and debug it?
>
> Thanks for your help,
>
> Michael
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