[Gluster-users] drop in write performance

[Pranith Kumar Karampuri]

On 02/02/2015 02:42 PM, Ason Hu wrote:
> Hi,
>
> In my small file test, 3 types of volume are created in same GlusterFS 
> Cluster (4 nodes)
>
>   * Distritubed
>   * Distributed Replicated
>   * Distributed Striped
>
>
> 10 million small files (8 byte) create and search each test cycle life
>
>
>
> Nodes info :
>
>   * OS : CentOS 6.6 64bit
>   * RAM : 64GB
>   * HDD : 4TB, 7200RPM, SAS *6 RAID 0
>   * FileSystem : XFS, BS=4K
>
>
>
> Problem :
>
> It occur when file reach ?200 million (sum of 3 volumes)
> files created speed drop from ?1500 to ?100
If you do this test directly on the XFS partition, what is the kind of 
performance difference you see?

Pranith
>
> Though the speed of creation become slow but search speed and 
> throughput still good
> Seems each types of volume have same problem, I don't know what cause 
> this problem..
>
>
> Workaround :
>
> I try to create new volume ( Distributed | Distributed Replicated | 
> Distributed Striped ), mount it,
> problem solved!
> But the old volume write speed still sad..
>
>
>
> I'd  try to increase below volume setting, but don't work at all
>
>   * performance.cache-size
>   * performance.io-thread-count
>
>
> I didn't enable the volume qouta option.
> Does glusterfs volume have some kind of limitation of file creation?
>
>
> Regards
> Nosa Hu,
>
>
>
>
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