what're the IO throughput (MB/s) for the test cases? Thanks. On 14-7-9 ??6:57, Xabier Elkano wrote: > > > Hi, > > I was doing some tests in my cluster with fio tool, one fio instance > with 70 jobs, each job writing 1GB random with 4K block size. I did this > test with 3 variations: > > 1- Creating 70 images, 60GB each, in the pool. Using rbd kernel module, > format and mount each image as ext4. Each fio job writing in a separate > image/directory. (ioengine=libaio, queue_depth=4, direct=1) > > IOPS: 6542 > AVG LAT: 41ms > > 2- Creating 1 large image 4,2TB in the pool. Using rbd kernel module, > format and mount the image as ext4. Each fio job writing in a separate > file in the same directory. (ioengine=libaio, queue_depth=4,direct=1) > > IOPS: 5899 > AVG LAT: 47ms > > 3- Creating 1 large image 4,2TB in the pool. Use ioengine rbd in fio to > access the image through librados. (ioengine=rbd, queue_depth=4,direct=1) > > IOPS: 2638 > AVG LAT: 96ms > > Do these results make sense? From Ceph perspective, It is better to have > many small images than a larger one? What is the best approach to > simulate the workload of 70 VMs? > > > thanks in advance or any help, > Xabier > _______________________________________________ > ceph-users mailing list > ceph-users at lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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