[Gluster-users] Read performances low compared to write (second try)

Vijay Bellur vbellur at redhat.com
Fri Jul 10 08:50:40 UTC 2015

On Friday 10 July 2015 02:18 PM, Olivier JAVAUX wrote:
> Hello,
> I am evaluating GlusterFS and I have a question about read performance compared to write performance.
> Release is 3.6.3-1 on SLES 11 SP 3.
> I have 12 storage nodes, configured in Ditributed-Replicated with 2 replicas.
> Network is 10 Gb ethernet.
> Filesystem used is xfs.
> When I am doing a simple test with dd bs=1M count=102400 (100 GB file with blocksize=1M), I have good perfs when writing:
>    around 550 MB/s - 10 Gb network is the bottleneck (2 replicas)
> but when reading, performances are less good: 470 MB/s
> I read one replica and read performances on the node itself might be better (around 800 MB/s)
> I tried several parameters:
>    performance.read-ahead: on
>    performance.read-ahead-page-count: 16
>    performance.io-thread-count: 32
>    performance.cache-size: 1GB
> I followed also performances hints for Linux kernel.
> Has somebody hints to increase these read performances?

Can you disable gluster's read-ahead translator and try again?

Additionally o/p of gluster volume info will be useful.


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