Le 13/08/2018 à 16:44, Emmanuel Lacour a écrit : > Le 13/08/2018 à 16:29, Jason Dillaman a écrit : >> >> >> For such a small benchmark (2 GiB), I wouldn't be surprised if you >> are not just seeing the Filestore-backed OSDs hitting the page cache >> for the reads whereas the Bluestore-backed OSDs need to actually hit >> the disk. Are the two clusters similar in terms of the numbers of >> HDD-backed OSDs? >> > > I looked at iostat on both cluster when running fio and yes, on new > cluster I see disks reads, but not with old cluster, everything comes > from page cache. > > So is there a way to simulate page cache for bluestore, or on rbd side? >
seems it has been discussed already here: https://www.mail-archive.com/ceph-users@lists.ceph.com/msg45321.html but one question remain ... which kind of memory tuning should we do on bluestore to get better use of osd memory?
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