HW recommendations for OSD journals?

[riccardo.murri@xxxxxx (Riccardo Murri)]

Hello,

I am new to Ceph; the group I'm working in is currently evaluating it
for our new large-scale storage.

Is there any recommendation for the OSD journals?  E.g., does it make
sense to keep them on SSDs?  Would it make sense to host the journal
on a RAID-1 array for added safety? (IOW: what happens if the journal
device fails and the journal is lost?)

Thanks for any explanation and suggestion!

Riccardo