Re: [ceph-users] cephfs, low performances

Hi, Sorry for my late answer. On 23/12/2015 03:49, Yan, Zheng wrote: >>> fio tests AIO performance in this case. cephfs does not handle AIO >>> properly, AIO is actually SYNC IO. that's why cephfs is so slow in >>> this case. >> >> Ah ok, thanks for this very interesting information. >> >> So,

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[ceph-users] how io works when backfill

Hi, When add osd or remove osd, ceph will backfill to rebalance data. eg: - pg1.0[1, 2, 3] - add an osd(eg. osd.7) - ceph start backfill, then pg1.0 osd set changes to [1, 2, 7] - if [a, b, c, d, e] are objects needing to backfill to osd.7 and now object a is backfilling - when a write io hits