hi, josh.durgin: i want to know how librbd launch io request. use case: inside vm, i use fio to test rbd-disk's io performance. fio's pramaters are bs=4k, direct io, qemu cache=none. in this case, if librbd just send what it gets from vm? i mean no gather/scatter. the rate , io inside vm : io at librbd: io at osd filestore = 1:1:1? thanks ----fio---- [global] ioengine=libaio buffered=0 rw=randrw #size=3g #directory=/data1 filename=/dev/vdb [file0] iodepth=1 bs=4k time_based runtime=300 stonewall -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.ceph.com/pipermail/ceph-users-ceph.com/attachments/20140909/7e09449d/attachment.htm>
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