All-Flash Ceph cluster and journal

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Hello.

By now we have SSD disks with a great perfomance under O_DIRECT/O_SYNC flags (and we recomended to use they for journal).

Why in a All-Flash type Ceph clusters we still use journal and them put a data into OSD? Why we can't just write a data into OSD with O_DIRECT/O_SYNC flags, without journal?

Can we just switch off the journal functional for all-flash ceph clusters?

--
Mike, runs.
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