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 _______________________________________________ Gluster-users mailing list Gluster-users@xxxxxxxxxxx http://www.gluster.org/mailman/listinfo/gluster-users
