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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@xxxxxxxxxxxxxx/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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