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

[Michael Post]

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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>> Gluster-users at gluster.org
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> 
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