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Thanks Somnath. I am running with CentOS7.2. Have you seen this pattern before? - epk From: Somnath Roy [mailto:Somnath.Roy@xxxxxxxxxxx] Which OS/kernel you are running with ? Try setting bigger read_ahead_kb for sequential runs. Thanks & Regards Somnath From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx]
On Behalf Of EP Komarla Hi, I am showing below fio results for Sequential Read on my Ceph cluster. I am trying to understand this pattern: - why there is a dip in the performance for block sizes 32k-256k? - is this an expected performance graph? - have you seen this kind of pattern before
My cluster details: Ceph: Hammer release Cluster: 6 nodes (dual Intel sockets) each with 20 OSDs and 4 SSDs (5 OSD journals on one SSD) Client network: 10Gbps Cluster network: 10Gbps FIO test:
- 2 Client servers - Sequential Read - Run time of 600 seconds - Filesize = 1TB - 10 rbd images per client - Queue depth=16 Any ideas on tuning this cluster? Where should I look first? Thanks, - epk
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