thanks for the reply. Yes, 4MB is the default. I have tried it. For example below (posted) is for 4MB (default) ran for 600 seconds. The seq read and rand read gives me a good bandwidth (not posted here). But with write its still very less. And I am particularly interested in block sizes. And rados bench tool has block size option which I have been using. Total time run: 601.106 Total writes made: 2966 Write size: 4194304 Object size: 4194304 Bandwidth (MB/sec): 19.7369 Stddev Bandwidth: 14.8408 Max bandwidth (MB/sec): 64 Min bandwidth (MB/sec): 0 Average IOPS: 4 Stddev IOPS: 3.67408 Max IOPS: 16 Min IOPS: 0 Average Latency(s): 3.24064 Stddev Latency(s): 2.75111 Max latency(s): 42.4551 Min latency(s): 0.167701 On Wed, Feb 10, 2021 at 9:46 AM Marc <Marc@xxxxxxxxxxxxxxxxx> wrote: > > try 4MB that is the default not? > > > > > -----Original Message----- > > Sent: 10 February 2021 09:30 > > To: ceph-users <ceph-users@xxxxxxx>; dev <dev@xxxxxxx>; ceph-qa@xxxxxxx > > Subject: struggling to achieve high bandwidth on Ceph dev > > cluster - HELP > > > > Hi, > > > > Hello I am using rados bench tool. Currently I am using this tool on > > the > > development cluster after running vstart.sh script. It is working fine > > and > > I am interested in benchmarking the cluster. However I am struggling to > > achieve a good bandwidth i.e. bandwidth (MB/sec). My target throughput > > is > > at least 50 MB/sec and more. But mostly I am achieving is around 15-20 > > MB/sec. So, very poor. > > > > I am quite sure I am missing something. Either I have to change my > > cluster > > through vstart.sh script or I am not fully utilizing the rados bench > > tool. > > Or may be both. i.e. not the right cluster and also not using the rados > > bench tool correctly. > > > > Some of the shell examples I have been using to build the cluster are > > bellow: > > MDS=0 RGW=1 ../src/vstart.sh -d -l -n --bluestore > > MDS=0 RGW=1 MON=1 OSD=4../src/vstart.sh -d -l -n --bluestore > > > > While using rados bench tool I have been trying with different block > > sizes > > 4K, 8K, 16K, 32K, 64K, 128K, 256K, 512K. And I have also been changing > > the > > -t parameter in the shell to increase concurrent IOs. > > > _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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