Hi all,
   In the era of Mimic, what are best practices for setting up cephfs on 
a hard drive only cluster?
   Our old cluster which began life in Emperor and has been upgraded 
until now running Mimic.  21 hard drives ranging from 1 to 4 TB. (Yeah, 
ceph doesn't like that.)  It has a triply replicated cache tier in front 
of a k2m2 erasure coded pool.  Our main usage these days is cephfs.
   I vaguely remember a few ideas, which might be out of date or never true:
   Bluestore is slower than filestore on hard drives.  ?
   Before release X replicated caches were needed to interface between 
writers and the erasure coded pool, but after release X one could write 
directly to the erasure coded pool. ?

Thanks for your input!
Chad.
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