> > Hi,all
> > we use openstack + ceph(hammer) in my production
>
> Hammer is soooooo 2015.
>
> > There are 22 osds on a host and 11 osds share one ssd for osd journal.
>
> I can’t imagine a scenario in which this strategy makes sense, the
> documentation and books are quite clear on why this is a bad idea. Assuming
> that your OSDs are HDD and the journal devices are SATA SSD, the journals are
> going to be a bottleneck, and you’re going to wear through them quickly. If
> you have a read-mostly workload, colocating them would be safer.
Hi，Anthony
Thanks for you reply,Yes,we use sata ssd.
where is the documentation or website of recommendation.
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