Hello, On Fri, 25 Mar 2016 08:11:27 +0000 Zhang Qiang wrote: > Hi all, > > According to fio, Exact fio command please. >with 4k block size, the sequence write performance of > my ceph-fuse mount Exact mount options, ceph config (RBD cache) please. >is just about 20+ M/s, only 200 Mb of 1 Gb full > duplex NIC outgoing bandwidth was used for maximum. But for 1M block > size the performance could achieve as high as 1000 M/s, approaching the > limit of the NIC bandwidth. Why the performance stats differs so mush > for different block sizes? That's exactly why. You can see that with local attached storage as well, many small requests are slower than large (essential sequential) writes. Network attached storage in general (latency) and thus Ceph as well (plus code overhead) amplify that. >Can I configure ceph-fuse mount's block size > for maximum performance? > Very little to do with that if you're using sync writes (thus the fio command line pleasE), if not RBD cache could/should help. Christian > Basic information about the cluster: 20 OSDs on separate PCIe hard disks > distributed across 2 servers, each with write performance about 300 M/s; > 5 MONs; 1 MDS. Ceph version 0.94.6 > (e832001feaf8c176593e0325c8298e3f16dfb403). > > Thanks :) -- Christian Balzer Network/Systems Engineer chibi@xxxxxxx Global OnLine Japan/Rakuten Communications http://www.gol.com/ _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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