El 09/07/14 13:14, hua peng escribi?: > what're the IO throughput (MB/s) for the test cases? > > Thanks. Hi Hua, the throughput in each test is IOPS x 4K block size, all tests are random write. Xabier > > 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 >> > _______________________________________________ > ceph-users mailing list > ceph-users at lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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