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.
Regards,
Vijay
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